Do you have any non-Yuneec APPS installed on the controller?
Have you tried a factory reset?
Have you tried deleting "FlightMode 2.0" and reloading from SD card?
Any information you can provide will help. Include anything you know that happened to the controller between the last time the controller worked correctly and the first time the problem appeared. A screenshot of your firmware versions page would be helpful.
Your title says Typhoon H Plus. Is it the H Plus or an old H or H Pro? They have different flight controllers and I would assume different methods of resetting? If it's an H you're in the right place, If it's an H Plus this is the wrong section. This note applies to your other H Plus post as well...