In that case, I would suggest that you have a hardware related problem. It could be due to faulty inter-pcb connections. A small amount of oxidation on these connections, can accumulate over time and cause intermittent faults, such as you are experiencing.
I note from your profile, that you are a computer technician, so I am sure you are aware of this type of problem. Perhaps you could dig inside your KN2000 and physically 'ease' some of the connectors ??
( Don't forget your anti-static wristband )

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Willum
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)