As I always say: SQ is not the be all and end all.
If THAT is their service in a rural area, and they don't do the simple things that ANY service department should (like, have basically all small parts - boards, sensors, belts, switches etc. - on hand with every service tech), there's no wonder service can turn into a nightmare.
It's the one thing the EU brands over here still do right: Every tech has a van with basically all small parts for almost all machines right there. You don't drive 50 miles, to see "Oh that issue is real", drive back 50 miles, order a part, wait, drive another 100 miles round trip to fit the part - just to have another issue.
You go there, fit the part, fit another part, and are done.
And that's just SO MUCH more important in a country that's far more stretched out than over here.
The issue of other failures spreading onto control boards isn't even such a new or unknown thing. Even Miele had such an issue with very specfic machines. Heck, even SQ has had a wave of those issues on their FLs a few years back.
That's just a thing that you have to go ahead and fix proactivley.
SQ's aren't bad machines.
But they aren't the "Just get them" solution many on here tout them to be...