My reciever (I think) is playing up. It just cuts out and stops responding at all, and it wasn't doing anything like this (in this car, or others) previously so I can't imagine what is causing it. It cuts out and comes back, very on/off, but it mostly only happens when the engine is running. Sometimes it just stays off.

I did put a different engine in at the same time, but I've used it in the car previously without this issue, so it doesn't really make sense that that would cause it.

I have also tried two different hump packs, so it's not the batteries.

It is the original 3PK, original HRS reciever, and 2x futaba digital servos (9350/9451).

Any suggestions appreciated (any known issues?), bit annoyed because I expected this gear to be reliable for a long time. If it matters, I'm using a switch (also futaba) but I've never had a problem with it/them in the past.