Same happened to mine, was in the Dominican Republic flying it at the resort and think their Wifi interfered with it and it drifted away not responding and hit the top of the swim up bar and went right into the pool. I was able to get it quickly and let it dry out for about a day and she worked...
I had mine drop into a pool as well, it was only there a few seconds but all I did was dry everything off and let it sit for about a day and surprisingly it worked perfectly fine afterwards