MMP and issues with RX staying bound

I'm running a new MMP in my Ve8. I have it set at the default voltage for the BEC. I've been having issues with the RX, and often have to rebind with the TX to get the system to arm properly. The only things plugged into the RX are the ESC and the steering servo. I can't recall right now which servo I'm running, I believe it is the Hitec 7949, its the $90 one....LOL

I'm using an Airtronics M11 system for the RX/TX. Do I need to up the voltage on the BEC? I really don't want to run an external BEC if can help it.

ben