Is the mains getting dirty? I mean lots of sharp voltage ups and downs and surges. After all, there is a lot in the news at the moment about solar flares that could cause electronic havoc around the world.
Over the past 6 months I’ve not had to change the power supply unit in anyone’s computer until the past 2 weeks when I have done 4. Just a coincidence or is the sun doing something nasty. Mind you, I wish it would warm me up more!