Is there no light on the HPWC or is there a red light? If no light, the issue is with your breaker tripping and there is no power to the WC. If there is a red light on the WC, there is a fault in the WC. In that case, use the rest button on the WC rather than the breaker. My WC started showing a red light at various times (although never while charging) and eventually totally failed. I now have a $550 piece of junk after just over 2 years of use and a one year warranty.
If the problem is at the breaker, it could be the breaker itself or could be caused by the car pulling too hard and demanding more amps than the breaker allows. If this is a new problem, check the charge setting in the car and make sure it is no more than 80% of the breaker rating. There have been occasions were the setting got inadvertently changed. It is also possible that the breaker needs to be replaced.