Some issues with brushless maiden run

Hi there,
Finally finished putting together a brushless e-maxx and took it out for a maiden test run and had a couple of issues questions.

1) how hot can the motor get? The motor controller wasn't warm at all, but the motor did get kinda hot, i.e. I cannot continuously touch it for more than around 5 seconds. Is that normal/OK?

2) The power connector to the motor controller keeps getting disconnected from the controller. It's connected via the 3.5mm connector. Should I just solder the connections directly?

Config:
E-maxx with
G-maxx chassis
Sypder 6 diffs
GA Bulks
RPM Arms
MGM ComPro 16016
7xl fiego motor
Strobe Slipper
16 tooth pionion
Proline 40 series bowties
proline shocks.

Have a nice day - Ewe Chye