Yes.How is the video fed back to the app? on the same 2.4ghz link through the controller and then wifi to a tablet, similar to 3DR telemetry module in Ardu?
You can connect from the HDMI out on the antenna side of the controller. That will help you ID from another port...still wifi from Solo to controller, but eliminating the wifi from controller to device.
Electrical contacts can fail sitting idle, being that many are lower pressure or not plated to prevent corrosion. Damp air will further these issues. If me, I'd start re-plugging all the video and wifi connections.
Garbled screen says a hardware/connection issue to me.