Not sure this will help at all and might be a worthless comment that everyone has done but make sure you have your transducer type loaded into your unit. My 7 touch showed a blank screen on DSI until I loaded the transducer type in. After that it worked great. It might be something you would overlook if you did a hard reset. I'm having the same problem others have mentioned with my screen freezing. Seems to start again after it pauses for a little bit. Usually have my depth on auto, will try changing the depth range. Thought it might need a stronger GPS signal receiver, but I don't know what that would have to do with my DSI screen freezing. Wondering if I changed my chart speed would make it better too. Haven't figured out how to do that yet. Guess I need to read my book.