Well this just started happening to me on my 2023 Plaid S that I've had since November. It only recently started occurring randomly in the last month or 2 and only at home.
Today I sorta figured out why but it is really strange. I have 2 wireless garage door remotes on the wall for my 2 garage doors. Apparently one of them triggers my charging port door about 30-40% of the time. I THINK I may have had to retrain that whole opener, it maxes out with a certain number of devices taught to it (5 or 6) and when we got our Rivian in March I believe I had to reteach all the wireless remotes/devices to it. I'm guessing that is when it started.
I'm not sure how to proceed, I may see if I can just reprogram that one wall remote that is triggering my charge port, or I may have to reset the whole unit and link all devices again.
Very weird.