BENGEN- Are you just using a standard "Y" and no extentions? How long are the leads? Are you using a votage regulator? Have you tried different digital servos or just these two?

I would have thought this would have shown up before now if it were a problem.

You may try using another "Y" and plug the batter directly into it bypassing the the RX.

I'll do some checking here to see if we can duplicate the problem.

Mike.