Hi everyone. Been a member for a while, but just do not have much time to post due to hectic radio schedule and equally hectic gigging schedule. Here is my trouble... I run an Ampeg SVT4PRO bridged mono into a Basson 8X10 cab through a BOSS GT6B effects board and X2 Wireless system. Lately I have been having issues with my signal cutting out. I checked the cables first, then wireless and effects with no joy. I noticed that the wireless was getting signal and I was getting signal into the SVT4PRO as well, because it would show to be clipping when I would crank it up, but no sound was coming forth. I removed the top from the SVT4Pro and began to notice that the fan was running pretty much full bore. Now I have heard the stories of 4PROs having cooling issues when rack mounted, so I left the top off and turned it off to let it cool. Switched back on and thought I had it fixed because I played for another twenty or so minutes and it happened again. Now prior to this, I have played outdoors in heat with no issues, in hot rooms with no a/c and never have I had an issue. I started paying closer attention and it seems to be happening at random intervals (sometimes after 5 minutes of playing) with nothing really to do with heat at all. Last night i had it in a cold air conditioned room actually fairly close to the a/c discharge with the top off and I noticed that there would be a clicking sound and the fan would rev up really high. A couple of minutes later another click and the fan would operate at normal speed and I had sound again. I switched the unit off and let it sit for a minute then back on and played for another hour until the gig was over with no problems. What gives here? Could there be something that is falsely telling the thermal senors or whatever that it is getting too hot when it is not? Can anybody help me? Thanks.