[RC-Monster Mike]

While preparing for my bash this weekend, Jamie from FLM and I installed a V2 on Jamie's truggy. We set up a couple controllers "just in case" (dremel bottom of case, heat shrink the fan wires). While preparing 4 units for the weekend, we found a few units that had interference between the plugs and the heat sink(potential short). I set these units aside and made the minor modifications to only the controllers that did NOT have the interference.
Jamie used the same controller all weekend long without issue - using the internal BEC on 5s with a Fg 10xl initially and finally with a 70mm Medusa motor(sent to me for testing). My guess is that the "flaming controllers" are very likely a direct result of the potential short across the heatsink. The internal BEC is perhaps another story, but I still would think that the tight interference fit of the case is likely a potential issue on this as well(stressing the boards as others have mentioned). Jamie's controller had the interference issues addressed before use and has worked flawlessly for a weekend of racing and some 1 on 1 racing Monday and Tuesday - even in wet conditions he had no troubles(burnded out 2 receivers from the moisture, but the MMM stayed strong).
Castle posted that the v3 units will have plugs on one aide and hard-wired wires on the other - this should eliminate the potential short issue, as there seems to barely enough room for the heatsink and plugs - many of the units I have looked at had a potential short on one side or the other(too tight a space for the heatsink between the plugs). If Castle modifies the case bottom to provide more room and eliminate the interference, the controllers will likely be rock solid - seems to me the problems are largely mechanical and not likely a poor electronics design(pretty sure Castle knows what works on the electronics side of things at this point). :)