Wow. Now I was also affected by it: My power amplifiers from the FT-817 blew up. After several hundred SOTA and /p activations it happened at home while I was listening to SSB satellites. Especially with the old non-ND versions (like mine) the power amplifier starts to oscillate by itself and destroys itself by self-oscillation then. The older MITSUBISHI RF POWER MOS FET 2SK2975 were not that good. I had already read a lot about this on the internet. The FT-817 suddenly became very hot and had a permanent current consumption of 2 amps. It was clear then that the FETs were short-circuited.