I've switched over to 1200 mah 6 volt (5 cell) receiver batteries and have never had an RX Reboot problem. I de-sensitize the servos by using expo where necessary.

I realize that this is not the same thing. The problem related in this post is losing the bind not re-boot, but I wanted to offer a suggestion to someone that may be concerned about that particular problem with the Spektrum system.

CGr