Before you fly again, you should save off your log files. Start the support ticket process and either email them to yourself or save them to Dropbox at the end rather than sending to 3DR, though you could do that also.
If you arm the machine it will create new files, and it only keeps 3 as tlog files where you can easily access them, so arm too many times and you lose easy access to the files.
You can download the Mission Planner PC app, and visually see what happened with the Solo from the flight controller perspective by playing back the flight tlog file. There is a "how to" thread on reading the log files on this forum.
Or you can upload them and have others take a look. There is a reason it did it, you just have to find out what it is. Understanding that may help you stop it from doing it next time.