On the R620s there's a section of blown track next to the servo connectors on the underside, the pictures only show the tops but I'll try and get one of the bottoms tonight so you can see. My working theory was that the excessive arcing/sparking of me inserting my removable link/fuse was causing the switch mode power supplies of the Tz-85As to start up then stop then start up which lead to much higher than expected voltages on the servo +5.5V rail. That would then blow the receivers logic. But I could only get the voltage up to ~7.5 Volts when I was testing with an oscilloscope and dummy load. *shrugs* I do want to find out what happened because I don't want my LemonRx to go the same way.

I'm currently using a Dx5i and considering upgrading to something with programmable configs and also some provision for basic telemetry.

The orange rx problems didn't stop after you left, I burnt out my other 2 on the 2nd day, I've made the switch to the lemons now as well but I haven't tested them in Ash yet.
Sorry to hear that, I had a good opinion of OrangeRXs before that weekend, but now its shot!