Dust in the rollers
A while ago (maybe 7 or 8 years ago) I had a similar problem. Found the band name and some replacement rollers (in Lowe's maybe). Removed the door and laid on the floor. But the replacements weren't quite right, didn't fit well. But the old rollers were jammed up with dust. Cleaned them, sprayed on silicon lube, reinstalled. Been smooth as silk ever since. One finger to pushed the door open/closed.
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