Well, this problem originally happened with a brand new spa. After several months of trying to figure out what was wrong, having the spa manufacturer replace every electronic component in the spa, and then having the entire spa replaced with a brand new spa, the same sort of problem continued.
The orginal spa did have some problems, like allowing water to leak onto the electrical box, that is why the entire spa was replaced. It has been over a week now and the spa still hasn't popped the breaker. This is by far the longest stretch of time. We shall see.