This morning I was looking around for an app I could use for screen recording. I was wanting to record the Solo app screen while it was in the air. I tried 3 different apps. On the third app I had it running in the background and had the Solo ready, opened the Solo app and it said it was disconnected even though I had video from the GoPro, and the controller said it was connected to the app.
Came back in and kept trying and couldn't get it working so I uninstalled screen recorder. That's when I found the update for the Solo app so I installed it. Went to connect and got the same thing. Shut down the device and rebooted and connected.
I found that the only way to connect was to shutdown and reboot, even after I killed all the apps. That last screen recording app I installed included a couple of services and I don't think they uninstalled.
Finally I just reset the device, installed Solo app, Solo services, and Tower. It's all working now without having to reboot.