The mild coastal climate here means Southworth doors don't fight the kind of hard freeze-thaw cycling that cracks metal further inland, but there's still occasional freeze weather in the mix, and cold snaps stiffen old lubricant and make a weak spring's last few cycles rougher than they'd otherwise be. That's usually the final push, not the root cause.
The real way this job goes sideways is someone trying to release or wind a torsion spring themselves. It's under real tension and it doesn't forgive a wrong move. The other way it goes sideways: replacing just the broken spring on a double-spring door and leaving the second one, which is the same age and about to go too. We replace both, every time, on a two-spring door - mismatched springs strain the opener and throw the door off level almost immediately.