Shift servo brown out?

[Antisimplistic]

Setup:

SCX10
RC4WD 2 speed
Futaba 4PK tx
Futaba R614FF rx
Holmes Hobbies TorqueMaster BR-XL
Hitec 37955S HS-7955TG
Axial kit steering servo for shifting

This works fine and then just doesn't. It's like the Rx stops working - nothing responds. When I unplug the shifter servo it works 100% of the time.

I think the shifter servo is stalling, pulling a bunch of amps and browning out the system, but I'm not certain. I noticed that it gets quite hot sometimes.

I've double checked the end point adjustments on the shifter servo and all seems fine.

Thoughts?
Do I need a BEC in this circumstance? I understand the Holmes BR-XL has a built in, but it may not be enough.

[tdevilman2009]

i would try switching out the current shift servo with a diff one. i have had the same prob with a few diff servos doing that.

[Charlie-III]

Really sounds like the shift servo is binding mechanically (on the trans) and drawing huge amps.
While an external BEC will "fix" the brownout issue, you will fry the servo.

I think you need to work on the shift linkage, not adding a BEC since most shift systems are very light loads and only need small servos.