I would isolate the switch just to be sure its not the cause of the prob. I run pretty much only Futaba stuff and haven't had an rx go bad. I use a 3PK and 3PJS txs, but with PCM and PPM rxs or a FAAST setup. I have a HRS rx, just have never used it.

Just a comment - the price of the r203 has come way down, these used to be about $100, now about half of that so if you have to replace it won't be quite as painful.