Most of these door mechanisms are sealed with a rubber strip around the outer edges that keeps out heat cold and excess noise.
Shower door makes popping noise.
Have tried to tighten the screws i could find tried some wd40 on rollers.
You may hear a whistling sound the telltale symptom.
Glass shower doors making clicking ticking sound.
For a while thought it was electronic air cleaner zapping discovered it was the shower doors.
Sliding doors have become a popular feature for entrances to patios gardens or conservatories.
Clicking ticking has been going on for weeks.