A worn roller doesn't usually announce itself with a bang. It starts as a grinding or popping sound as the door travels, gets louder over a few weeks, and then either the roller stem snaps or the roller jumps the track. On a door that's been running rough for a while, the track edges themselves can bend from the roller riding crooked, which turns a roller swap into a roller-and-track job. We also see the plastic rollers that came stock on some builder-grade doors from the early 90s crack straight through after enough winters of contraction and expansion - plastic doesn't handle severe cold the way nylon or steel does. If you're hearing a rhythmic thump every time the door moves, that's almost always a flat spot worn into one roller, not the opener.