Midi keyboard doesn't work every once in a while

This is the most strangest thing I have encountered so far. Everything is working, putting notes into Logic via my midi controller. All of a sudden, it stops working. I try to play notes on the keyboard but nothing, no response. I can play them fine with the mouse on the virtual keyboard (on one of the instances - Kontakt 3), but not via my controller. I don't push any buttons by accident either for it to stop working.
I close the project, reopen it, but nothing. I restart the computer but nothing. If I open a new project THEN it works. I have it set on midi channel 1. Sometimes I switch it to omni and it starts working. But not lately.
What is the problem here?
Thanks.

What make and type is it?

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I bought a brand new Kurzweil PC88 12 years ago and still working incredible! As far as being recognized by Logic (Express, Pro, Studio, etc), I have never had any problems, except for one situation with an M-Audio Midisport 2x2. What I currently use is the M-Audio UNO USB MIDI interface and works perfect! Really simple and friendly device and have never heard any bad review from it.
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- If this doesn't work, you should consider a different MIDI interface and also contacting Kurzweil (YoungChang) for further information, not to have your PC88 reseted, unless you have nothing to lose.
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Midi keyboard doesn't work every once in a while

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