LRP Flow works ESC problem

[nige0568]

I've got an LRP Flow works team ESC in my 2wd that has been working perfectly for many many months.
I've been using it with a Futaba T4GRS transmitter but I've recently purchased a Sanwa Exzes Z, I connected it all up to the RX-471 receiver and all was fine up until about 2 minutes into the first practice session last Sunday when it completely lost throttle, steering working but throttle not, and all 3 led's were flashing on the ESC.
I went back to my Futaba receiver and it now works fine again with my T4GRS apart from the receiver voltage fluctuating between 3.5v and 5v and the steering being very slow and not having enough torque to get it round a corner, the fan also stops when I operate the steering.
I have tried a spare ESC and the steering is fine so I know the servo is good.
I've checked the settings on the Exzes Z and channel 2 for the throttle was set to SSR mode.
Is it possible that I have blown the BEC voltage regulators? If so can it be repaired?
I was going to email Jamie Booth but there is a message on his website that he is on holiday.
Sorry for the long post.