My Line6 M5 has gradually become quite flaky. This morning at worship practice it cut out completely. Fortunately it only took me a couple minutes to figure out where the problem was and take it out of my chain. Some of the (intermittent) problems are as follows: (1) Excessively flickers on power up (2) Fails to power up at all (3) Unwanted power cycling when pressing on foot switches (4) Audio cuts out, generally not fixed until power cycling (5) Other weird randomness (mode switching, preset weirdness, etc.) I didn't find any help searching TB, but I found this thread on the Line6 website: http://line6.com/supportarchivenew/thread/88421 The third post (out of only five on that page) seems to have a very interesting diagnosis and solution, to do with grounding of the pedal. I ran it by a friend of mine who is an expert in electronics (but no pedal specific experience), and he thought it was at least plausible, and more like probable, that this is indeed a grounding issue. And I wanted to throw it out there to you TBers who might have both the electronics and pedal expertise to weigh in. Or, any specific M5 experience would be great, too. For more context, I bought my M5 used. The rubber feet and screws had already been removed, so that the bottom piece of the metal chassis is a bit loose (but still held in place by, I think, one or more screws on the side). It is connected to a PT Pro by Velcro. It is powered by a 9V 400 mA outlet on a Pedal Power Mondo. (There is some conflicting info out there about whether or not the original power supply is 250 mA or 500 mA. I have seen third party claims that 400 mA should definitely be adequate.) So...any thoughts would be greatly appreciated!