Left AirPod pro not working tried to reconnect and that didn’t work

I Have had quite a few AirPod Pro issues in my time usually all of them are fixed by ensuring they're completely charged and then putting them in the case and resetting them (holding the button on the back down until the light flashes red a few times usually 10+ seconds).

Then just give the AirPods a few seconds to start flashing white again and all should be working fine.

If this doesn't work I would recommend reaching out to apple support, because they would more than likely try these steps with you they would probably want tot get them replaced.

Hope this helps!