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If you search SBT on the forum here you'll find some posts of people having problems with their SBT engines failing after a year. Sadly due to covid I think SBT has been the quickest turnaround time, though. I am unsure on finding any other replacements or reputable shops though, sorry! Hopefully someone will chime in with an answer.
I have had a few mention that, I guess its a common thing?
Because mineral build up still occurs and the skirt still swells when sitting in water. I can testify to that as I rebuilt my 2016 plugs last year because I wasn't diligent enough with pulling the plugs and one was getting to the point I was having difficulty pulling it out at all! Fortunately the rebuild is cheap! (heck...all they really need to sell if the rubber ring!)