Are you using the Tesla EVSE you recommend? Does the Tesla EVSE by chance go to some power save mode that the Bolt can't wake it from when it expects to get line access?
Would be interesting to see if it is something with the vehicle or might be something with the EVSE that is causing the issue.
Any non-factory electrical accessories on the Bolt? Anything that has been modified or changed from stock, however typically negligible?
It should not matter plugged in or unplugged, according to what has been posted about the Bolt maintaining the 12V battery, as it has happened while plugged in I would be very suspicious of some incompatiability between the Bolt and the Tesla EVSE if that is in fact what you were using.