The part about my 32xx GMT master that REALLY ground my gears:
Watch goes from dead-on for years. I go on a business trip, and realize it loses 15s, then 30s, then a minute and a half, 3 consecutive days. After that it stabilizes at about 1-2 mins/day of loss. I wear it another few weeks on/off and keep experiencing the same.
Fortunately, I have a few months of warranty work. I send it in with about a month left on my warranty. 4 months later I get a message: "Your watch is out of warranty a service is going to be expensive, are you sure you want that?". I responded with: "Um, you got it under warranty, so you'd better be fixing it under warranty". Next response: "The watch seems to be in-spec". Me: "Timegrapher says otherwise, as does a series of photographs of it on a counter after a full-wind showing that it is losing time".
They go silent for another 6 months, and finally come back with, "well, we'll do a service as a one time cOuRtEsY". A few months later, the watch returns and is running fine.
FIRST: This is clearly the 32xx problem. SECOND: they tried to tell me the watch was out of warranty (because they held it for 4 months), THEN tried to tell me that losing that much was 'normal'. THEN they refused to admit they were wrong other than "well, to shut you up we'll do it<but you're still wrong>".
OMEGA service is the absolute opposite I've found, which is why I own only 2 Rolex, and god-knows-how-many Omegas now.