I've got a friend that has been having problems with his 396 dropping all
satellites. He just emailed me the following:

"First, I finally isolated the problem to my audio panel. I had all the
radios off and still no GPS signal. Then just for fun I shut off the audio
panel and instantly the 396 locked on. After verifying this several times I
knew what was causing the problem but not how to fix it.

I talked to Garmin and PS eng at OSH along with several avionics shops and
none of them ever heard of my problem. They suggested that I relocate the
GPS antenna and wiring but that didn't help.

Last week I called tech support at PS Eng and they said they knew about the
problem and were able to reproduce it on the bench. They also said just send
it in for a no charge (same day) fix.

And hopefully that's that!"

Jim