This might occur if the connection between PowerTracks and your external keyboard is being lost, such that note-on or note-off messages are occasionally not being received.
Here are some things to try:
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Close PowerTracks and delete the configuration settings file "ptw.ini" from the C:\pt folder. You may want to make a backup of this file first, as this will return many global PowerTracks setting to their factory defaults. Deleting the file will cause PowerTracks to re-connect to your MIDI drivers, and eliminate the possibility that this file was corrupt.
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Make sure that your MIDI cables and USB cable (if applicable) are firmly connected. If you are using a USB hub, try connecting the USB cable directly to a USB port on your computer.
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Reinstall the drivers for your MIDI interface, using the latest drivers available from the interface manufacturer's website.
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Close other programs while using PowerTracks. There may be a conflict with another program running on your computer.
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If the problem persists, try a different MIDI interface if possible.