Observe where it catches
Move the panel gently only if the glass and panel appear stable. Note whether resistance occurs throughout the opening or at one repeatable point. A local catch suggests checking that section of track; continuous drag can involve dirt, roller wear or panel alignment.
Try a simple cleaning check
Vacuum loose grit from the exposed track, then wipe reachable surfaces with a soft damp cloth. Keep drain openings clear. Do not remove the panel, bend the track or apply thick grease as a trial repair.
What persistent resistance tells you
If cleaning does not change movement, describe any grinding, dropped corner or uneven closing gap when asking for an assessment. Ask that the rollers and track be checked together. The same symptom can have several causes, so avoid ordering parts from the symptom alone.
The guidance here is general. Your door manufacturer’s instructions and an assessment of the actual system take precedence.
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