Problem with: LRP#80950 SXX TC Spec Shutting Motor Down

[lucas-b4-b44]

Products used together (all very very new) :

ESC: LRP#80950 SXX TC spec Brushless Speed-Control (Setting: 1.1.1.1 fan not installed)

Motor: LRP#50672 Vector X12 Brushless Modified - 6.5t (Timing: 00 factory default)

5300 Battery: LRP#79868 LiPo Competition Car Line Hardcase 5300 - 40C - 7.4V

4800 Battery: LRP#79866 LiPo Competition Car Line Saddle Hardcase 4800 - 40C - 7.4V

Buggy: Team Associated B4 Factory Team 2WD Buggy

My ESC shuts down motor after about 4:30 to 5:00 mins of use with a fully charged 5300 Battery, when full throttle for a couple of seconds both Mode lights flash alternately then stop and go to default solid red light on mode, the temps in celcius are: Motor=50, ESC = 55, Battery=23 so no problems with heat.

Waited 5 mins still wouldn't start up motor.

Tested voltage of battery on Hyperion EOS0720i Net3 Charger = 65% or 7.857v for pack or 3.928v per cell. So can't be low voltage cutoff?

Tried different 4800 Lipo pack, car started straight away, swapped back to first battery now runs again??? used initial 5300 battery another 7 mins and fine no problems.

But this occurred once more with 5300 Lipo pack after 4:30 mins again..... motor cuts off wont start. Put in an NiMH battery to test: motor runs again.

This has happened, twice in the 3 times I've used the setup, and I've only driven the car 3 times with this new 5300 lipo pack. It has not occured with my B44 which is using the exact same setup as above with 4800 Lipo, but with 5.5T x12 motor (obviously diff gearing etc...same ESC with fan installed)

Could this have occured due to over current protection??? and resets after a while, why would anything be giving too much current?

I'm loath to have to send my ESC & Battery back, hope there is an obvious reason I can remedy

Sent same letter to SMD, will post it here when it comes too.

Thanks for your time .

Regards Lucas