A grinding or popping sound as the door moves usually means a roller bearing has failed, not the opener. If the door shudders at the same spot on every cycle, check the rollers in the track first - chipped or flat-spotted rollers hit a weak point and jump. Out here, with 4,110 households and most doors dating to the 1970s, we see a lot of hardened, cracked rollers that still turn but have lost their round shape, which chews up the track slowly and makes the door louder every month rather than failing all at once. If the door is skipping or jamming rather than just loud, that can also point to a bent track, which a roller swap alone won't fix.