I don’t think this glitch is random, it happens when you hit the ceiling fan. The same thing happens if you manage to bounce off a trampoline while in noclip mode.
Look at 0:53, i don’t hit the fan, and i’m falling without touching anything. (not even the noclip key)
I tried noclipping in the same area in my own condo just to see if I could reproduce this. I tried for a few minutes but nothing happened. I still think it has to do with your fans seeing as they are pretty close to where you’re flying on the ceiling.
What happens if you remove the fans and then try noclipping again?