Looking to confirm my suspicions about an appliance if that’s okay.

So I did some troubleshooting and I want to see if folks agree with what I’m suspecting. 

Bought a scratch and dent Frigidaire freezer from a local appliance place. I plugged it into the external outlet in my garage (the garage was built after the house, so one of the outlets in there is an external one that was there before the garage was built), where a neighbor told me a fridge was plugged into when the previous owners lived here. 

5-10 seconds after I plugged it in, the 20 amp breaker tripped. Interesting.

So I moved it to a different place in the garage and plugged it into a different outlet, which was a GFCI outlet and on a different breaker. Awesome, it was working. “So,” I said, “probably just need a new 20 amp to replace the one that tripped due to it being old or sensitive or whatever.”

Fast forward maybe six or seven hours last night, and I noticed the GFCI outlet was tripped. So, I reset it, plugged it back in, and about 15 seconds later it tripped again. Huh. So I moved it to another outlet. That one also tripped a few seconds later.

I’m inclined to believe that the freezer is the problem, and the local place is going to bring a new one Monday. I’m thinking that’s the case because all the newer outlets in the garage are wired to one of three different breakers - those breakers didn’t trip, the GFCI outlets themselves did. And the original one I hooked to, as I said, had a refrigerator (with an ice maker!) plugged into it without any issues.

I just wanted to see if anyone on this forum would agree or disagree. I know so much less about these things than most people, so I just wanted to make sure my suspicions were, at worst, well founded, and at best right on the money. Any help is appreciated. Thanks in advance.