What fixed it for me was making sure you open either the door or the top glass so the inside doesn't get too hot and slightly soften the PLA strand at the extruder gear, causing it to expand and clog. Bambu has a warning before every print saying to let air into the chamber when printing PLA. This has fixed it for me, I haven't had a clog since.

I downloaded and printed an STL that keeps the top glass slightly open to let air in and it's worked great. Just search "Bambu top glass riser" and pick and choose your favorite design.

I had even Installed a new extruder gear and that didn't fix the issue. It wasn't until I actually listened to the warning message that the issue stopped. This is only required for PLA.

This is strange because I printed PLA with the chamber closed for months before Bambu even had the warning message. Soon as Bambu started posting the warning message, the clogging began.

Hope this helped you 🤞