I just picked up a Mod 50 in a trade with a dual module. I played it for about 5 minutes or so (on the low power setting) and the sound went out. I switched it to stand by and tried the "high power" side. Nothing. Switch out cables and tried a new cabinet. nothing. I shut it off and then turned it back on after a few minutes to the "high power" section and it worked fine for a few minutes. I switched it to the low power setting and it worked for about 10 seconds before going out again. Tried to switch back to high power. Nothing. Any ideas would be appreciated. Thanks.