My visit to the dealer for the surprise liftgate closing ended up showing no error codes generated, so don’t know what’s going on. If this continues to occur I’ll have the dealer try replacing liftgate system parts. That was their offer, but I’d like to rule out the possibility of fluke occurrences first. I don’t wear tight fitting pants so keys pressing against the keyless fob doesn’t seem likely. This was mentioned as a possibility by the service writer.