What's with the electric?

I went out to turn on the sprinkler this morning (since the power had been out it hadn't run in a few days) and found the power out again. Once again, it was the GCFI that had been tripped and I needed to press the reset button. I cannot imagine what is causing this because nobody used any power on the garage circuit at all. We don't know if moisture is getting in somehow or what. Now I am in a bind because I don't know if it is something the landscaper did or something the electrician did. I specifically did not want multiple contractors working on this for this very reason. I'm stuck in the middle trying to figure out who did what and who can fix it. I think the landscaper may have done something when he was here last week because it just started happening. But of course, I'm sure he'll deny it and then I'll have to call the electrician and pay the minimum visit charge. He'll probably deny it too. I wanted the landscaper to take care of all this, but he told me halfway through the job that I had to hire an electrician to get the outlet put in. At that point I had no choice since he wasn't willing to do it and we had a signed contract. Ugh.

The general contractor was supposed to be here between 10-11 this morning and never showed and hasn't called as of yet.