intermittent faults aver very hard to pinpoint. the most efficient way to troubleshoot this sort of things is to replace components (KPS,KDS, cables,...) until problem is resolved. i recall similar issue with one of the KRC2 and ultimately it was determined that cause was one of the cables going to KPC. but it took long to find it out because everyone was interested in swapping electronics... that works to in many cases but issue could be wiring, power, etc.
totally agree i am just thinkng that sometimes i fixed the problem but then 5 days later same fault back i just lost my confidence about this issue, cuz it doesnot make any sense.