I would check the voltage at the contactor continuously until it cuts out. Does it drop slowly? Also check all cables and wires for good connection.

Code E107 - Contactor Off
-Reason-
Contactor probably present but controller could not close it successfully.
-Possible Cause/ Corrective Action-
Problem with main contactor tips.
* If contactor clicks prior to displaying this code, polish contactor tips. If
this is unsuccessful, replace contactor.
Low voltage.
* Try closing contactor with a known-good battery.
Short in contactor coil wiring.
* Replace contactor.