jzemaxx,
i just sent back 2 that had the very same problem.


they seem to go along great, and then all of the sudden they lose power and nothing works. i too tried to bypass the switch, but nothing worked there either.
My lhs just sent 3 systems back for a customer who does mailorder in ST. Thomas that had the very same issue. one was from a 2200 system, one was a standalone V3 and the other was a flux esc....... this is semi- alarming to me as 90% of all my vehicles use 4S-6S and need higher voltage escs.
i just went and bought 3 more back-up MMM systems, and i still have a LT-6S and a 150A EZ-run so hopefully that will hold me up for awhile.