from what I'm hearing on other forums, owners are experiencing this on too much of a regular basis - they are thinking that it's an overheating situation. Maybe even try to put a fan on it for the time it's charging, to keep temps down. If it's not tripping the breaker, it's not overloading the wiring, which means it's the internals of the charger device.
I would also try another EVSE to see if the problem persists, and if not, the PRO CHARGER is to blame, and likely might even wind up being a recall from either Ford or their supplier/Sunrun.
Having issues charging is not going to fly with any EV owner, especially new LIGHTNING owners who depend on the charge to happen everyday/night so that they are fully supplied for the next day's needs.