Servo cuts out? Failsafe?

[wrcallar]

Hi,

Hope you can help.

Just built a mad monkey with a Tower pro MG995 cheapo from ebay and a 35A ezrun esc.

Issue:

-I hold left on my Spekky and the wheels turn left, then centre, then left, then centre. Same with right. Sometimes the wheels don't work at all. When it centres, my SR300 light turns off momentarily.
-Throttle works fine on it's own, cuts out when I steer though.

Is the servo pulling to much power and therefore shutting down the rest of the electronics and setting the car to failsafe?

I don't want to buy a BEC when I shouldn't have to, could the servo be faulty and therefore replacing with somehting like a BMS 661DMG + HS fix this issue?

Thanks,
Wayne