Mamba Max 5700 in my T2

[RC-Monster Mike]

The slight rpm excess won't typically affect anything operationally really - higher rpms are generally going to draw more juice, though. The cutout could be a couple things. If you suspect it is the BEC, disable the controllers BEC and use a receiver pack for a run - if it happens in the beginning of the run, I suspect it isn't heat related(if it happens after running for a bit, it is more likely). Depending on your batteries, it could be voltage drop in the cells, as well. It could also be a servo causing the glitch or a crystal from your radio equipment even. The only way to truly track it down is trial and error.