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With all the cables removed it does the same thing. But it's erratic
and unpredictable. One minute it works fine, next minute it restarts.

I also noticed that there is a humming noise present that gets less
intense if the volume is in the middle, at 12 o'clock. If the volume
gets increased or reduced, the humming gets louder. (and sometimes it
restarts) Also, if you decrease any of the parameters using the panel
knobs the flickering seems to subside. It's almost as if the unit is
drawing too much power when the LED's are all lit up. The more LED's
lit, the more it flickers, and the more likely it will reboot. This
includes the segmented display, keypad, and little red LED's. It's
gotta be a power supply problem. I've tried replacing the wall wart
to no effect, so it must be interior. Sometimes just tapping on the
unit makes it reboot, but like I said, I checked for loose
connections between the boards, and loose grounds.

I'm lost!

n8