Wierd mamba max pro issue

[hootie7159]

Hey guys, quick question for all you MMP users out there....I have MMP that I've been running in my 10sc for the past year and it's been working great! However, after only running on 2s 40c 5000mah's I wanted to see how fast this thing is on 3s...when I plug in the 2s pack's the esc arms up fine, no problem...however, when I plug in the 3s pack, nothing happens...?? (no power to Rx, servo either and all connections on batteries and voltage is good)
The esc also doesn't arm when I plug in my 4s or 5s lipos as well.....BUT after running a whole 2s pack through my truck, the esc then powers up just fine. Anyone else have this issue? Guess the MMP doesn't like cold starts?