There are lots of the Novak HV's running in TRX rcs. You have some kind of problem. Ck the antenna wire - look for a nick or slice of some kind. Make sure antenna wire does not touch chassis. I 've seen some advice to braid the motor wires to reduce any field.

Obvious - tx/rx batts are fully charged?

Email Novak - ck their site, one of their guys is bound to post here - I know they do on RCCA and RCM.