[Kenwood] TS-950SD Receiver

[Chris Allingham]

The receiver on my TS-950SD randomly goes quiet.  The S-meter goes full 
scale and I can't hear anything.  It's as if the RF-gain was turned all the 
way back.  Sometimes it will correct itself within a second or two. 
Sometimes cycling the power on an off will correct it, other times I have 
to leave the power off for a while.  Sometimes it happens shortly after I 
turn on the rig, other times it starts happening after the rig is on for a 
few hours.  Sometimes the receiver will go quiet (and full S-meter) for a 
long time (minutes), other times it will quickly cycle between working and 
not working, as if someone was playing with the RF-gain knob.  I've reset 
the microprocessor, but it's still the same.

Has anyone experienced this before (not necessarily with a TS-950)?  What 
was the root cause?

Any input it appreciated.