Similar thing happened to me the other day after Solo decided to fly sideways on its own. It had a "soft" (it was only about 3 feet high) crash and flipped over. When I got to the craft a couple minutes later, the motors were twitching. When I picked it up, they all spun. I killed power to the controller which shut down the Solo as well. The motors were pretty darn hot. I tried a few minutes later to power up the Solo, but the battery LEDs went lit up for a second or two, motor #1 twitched once and the unit shut off. This still happens after fully charging the battery and letting it all cool off.
Do you think pulling the motor pod and putting it back in may help? I hope that would not void the warranty.