Left AirPod not working after 2 minutes of use.

My left airpod turns off after about 2 or 3 minutes while still having charge. The sound just cuts off and I have to put it in the case and wait for a couple of minutes to make them work again, only to repeat the whole process (working fine for 2-3 minutes, and then shutting off again).

Tried forgetting the AirPods on my iPhone, resetting the case, using them with a Windows PC and an android phone, and this just keeps happening just the same.

These are the first gen AirPods and before the left one starting failing they’re were used rarely (not a battery problem, since they still have plenty of juice when they shut off).

I don’t know if it matters (since I’ve tried them with several different devices from different makers) but my iPhone is an 11 Pro Max.

Thanks for the help!