My VoomPC-2 with M2-ATX HV power supply shuts down whenever there's just a little bit of RF near it. Transmitting with a 100mW handheld on 145MHz is enough to initiate a shutdown. A RG-400 coax cable carrying 5W running near the power wiring has the same effect.

The shutdown is proper, so not a crash or anything. It's just as if the switch wire loses power. I tried adding 100nF capacitors to the switch wire, as well as on the PIC controller itself, no improvement.

Is this a known issue? Any ideas how to fix this?