Mixxx is runnig but freeze by taking more and more memory

[an225]

Hallo.
I installed Mixxx 1.10.0 ca. 3 weeks ago, everything worked fine. But now when I start mixxx every time it is taking more and more RAM a then is swapping on HD and everything freeze because of swapping. Of course it takes also a lot of CPU performance.
I use ubuntu 12.04 and PC is quite old, but it was working and now I don't know what happens, and how to fix it.
Thank you for your answer.

Here is my last log-file:
Debug: [Main]: Mixxx 1.10.0 "(built on: Jan 27 2012 @ 10:49:38; flags: hifieq mad midiscript optimize qdebug shoutcast verbose vinylcontrol)" is starting...
Debug: [Main]: Qt version is: 4.8.1
Debug: [Main]: Configuration file is at the current version 1.10.0
Debug: [Main]: Loading translations for locale "en_US" from translations folder "/usr/share/mixxx/translations/" : fail
Debug: [Main]: Found folder 'Mixxx' within default OS music directory
Debug: [Main]: Could not create folder 'Recordings' within 'Mixxx'
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Channel1]" , "vinylcontrol_mode" )
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Channel2]" , "vinylcontrol_mode" )
Debug: [Main]: JACK client name set
Debug: [Main]: Available QtSQL drivers: ("QSQLITE", "QMYSQL3", "QMYSQL")
Debug: [Main]: src/library/trackcollection.cpp DB status: true
Debug: [Main]: SchemaManager::upgradeToSchemaVersion already at version 13
Debug: [Main]: TrackDAO::initialize QThread(0x9af03d0, name = "Main") "qt_sql_default_connection"
Debug: [Main]: CrateDAO::initialize()
Debug: [Main]: CueDAO::initialize QThread(0x9af03d0, name = "Main") "qt_sql_default_connection"
Debug: [Main]: Promo dir: "/usr/share/mixxx//promo/1.8.0/index.html"
Debug: [Main]: Traktor Library Location=[ "/home/peter/collection.nml" ]
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Flanger]" , "lfoDepth" )
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Flanger]" , "lfoDelay" )
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Flanger]" , "lfoPeriod" )
Debug: [Main]: CachingReader using 4980736 bytes.
Debug: [Main]: CachingReader using 4980736 bytes.
Debug: [Main]: CachingReader using 4980736 bytes.
Debug: [Main]: CachingReader using 4980736 bytes.
Debug: [Main]: CachingReader using 4980736 bytes.
Debug: [Main]: CachingReader using 4980736 bytes.
Debug: [Main]: Constructed LibraryScanner
Debug: [Main]: iTunes Album Art path is: ""
Debug: [Main]: MidiDeviceManager::getDeviceList
Debug: [Main]: Scanning PortMIDI devices:
Debug: [Main]: Found output device # 0 Midi Through Port-0
Debug: [Main]: Found input device # 1 Midi Through Port-0
Debug: [Main]: Linking to output device # 0 "Midi Through Port-0"
Debug: [Main]: Starting script engine with output device ""
Debug: [MidiScriptEngine 1]: MIDI Device in script engine is: ""
Debug: [Main]: MidiDeviceManager: Setting up devices
Debug: [Main]: PortMIDI device "1. Midi Through Port-0" already closed
Debug: [Main]: MidiMapping: Loading MIDI preset from "/home/peter/.mixxx/midi/Midi_Through_Port-0.midi.xml"
Debug: [Main]: MidiOutputMappingTableModel::removeRows()
Debug: [Main]: "Midi Through Port-0" settings found
Debug: [MidiScriptEngine 1]: MidiScriptEngine: Loading & evaluating all MIDI script code
Debug: [MidiScriptEngine 1]: MidiScriptEngine: Loading "/usr/share/mixxx/midi/midi-mappings-scripts.js"
Debug: [Main]: MidiMapping: Input parsed!
Debug: [Main]: MidiMapping: Output parsed!
Debug: [Main]: Promo dir: "/usr/share/mixxx//promo/1.8.0/index.html"
Debug: [Main]: loadSettings: 1 0 "ConstantPower"
Debug: [Main]: slotApply crossfader: 1 "ConstantPower"
Debug: [Main]: BpmSchemes::readXML "/home/peter/.mixxx/mixxxbpmscheme.xml"
Debug: [Main]: MidiDeviceManager::getDeviceList
Debug: [Main]: MidiDeviceManager::getDeviceList
Debug: [Main]: SoundManager::setupDevices()
Debug: [Main]: SoundDevicePortAudio::open() "0, HDA Intel: ALC880 Analog (hw:0,0)"
Debug: [Main]: framesPerBuffer: 1024
Debug: [Main]: Requested sample rate: 48000 Hz, latency: 21.3333 ms
Debug: [Main]: Output channels: 2 | Input channels: 0
Debug: [Main]: Opening stream with id 0
Debug: [Main]: Opened PortAudio stream successfully... starting
Debug: [Main]: Dynamically loaded PortAudio library
Debug: [Main]: PortAudio: Started stream successfully
Debug: [Main]: Actual sample rate: 48000 Hz, latency: 42.6667 ms
Debug: [Main]: Using "HDA Intel: ALC880 Analog (hw:0,0)" as output sound device clock reference
Debug: [Main]: 1 output sound devices opened
Debug: [Main]: 0 input sound devices opened
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Samplers]" , "show_samplers" )
Warning: [Main]: Requested control does not exist: "[Samplers],show_samplers" . Creating it.
Debug: [Main]: Making property binder for "visible"
Warning: [Main]: Object::connect: No such slot QGroupBox::setProperty(const char*, const QVariant&) in src/skin/propertybinder.cpp:13
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Sampler1]" , "hotcue_38_position" )
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Sampler2]" , "hotcue_38_position" )
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Sampler3]" , "hotcue_38_position" )
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Sampler4]" , "hotcue_38_position" )
Debug: [Main]: BaseTrackCache(0x9d001d8) updateIndexWithQuery took 1 ms
Debug: [Main]: PlaylistTableModel(0xa699cd8) select() took 2 ms
Debug: [Main]: PrepareLibraryTableModel(0xa723b60) select() took 1 ms
Debug: [Main]: PrepareLibraryTableModel(0xa723b60) select() took 2 ms
Debug: [Main]: PrepareLibraryTableModel(0xa723b60) select() took 1 ms
Debug: [Main]: DlgPrepare(0xa729bb8, name = "DlgPrepare") analysisActive false
Debug: [Main]: MixxxLibraryFeature::activate()
Debug: [Main]: LibraryTableModel(0x9d00438) select() took 1 ms
Debug: [Main]: WSearchLineEdit::restoreSearch( "" )
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Vinylcontrol]" , "show_vinylcontrol" )
Warning: [Main]: Requested control does not exist: "[Vinylcontrol],show_vinylcontrol" . Creating it.
Debug: [Main]: Making property binder for "visible"
Warning: [Main]: Object::connect: No such slot QGroupBox::setProperty(const char*, const QVariant&) in src/skin/propertybinder.cpp:13
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Microphone]" , "show_microphone" )
Warning: [Main]: Requested control does not exist: "[Microphone],show_microphone" . Creating it.
Debug: [Main]: Making property binder for "visible"
Warning: [Main]: Object::connect: No such slot QGroupBox::setProperty(const char*, const QVariant&) in src/skin/propertybinder.cpp:13
Warning: [Main]: QGLContext::makeCurrent(): Cannot make invalid context current.
Debug: [Main]: createWaveformViewer()
Debug: [Main]: WaveformViewerFactory :: Creating new simple waveform
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Spinny1]" , "show_spinny" )
Warning: [Main]: Requested control does not exist: "[Spinny1],show_spinny" . Creating it.
Debug: [Main]: Making property binder for "visible"
Warning: [Main]: Object::connect: No such slot QGroupBox::setProperty(const char*, const QVariant&) in src/skin/propertybinder.cpp:13
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Channel1]" , "hotcue_38_position" )
Debug: [Main]: createWaveformViewer()
Debug: [Main]: WaveformViewerFactory :: Creating new simple waveform
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Spinny2]" , "show_spinny" )
Warning: [Main]: Requested control does not exist: "[Spinny2],show_spinny" . Creating it.
Debug: [Main]: Making property binder for "visible"
Warning: [Main]: Object::connect: No such slot QGroupBox::setProperty(const char*, const QVariant&) in src/skin/propertybinder.cpp:13
Debug: [Main]: ControlObject::getControl returning NULL for ( "[Channel2]" , "hotcue_38_position" )
Debug: [Main]: Displaying mixxx
Debug: [Main]: Running Mixxx