Infotainment screen grays out when adjusting climate, Faulty fuel gauge,Water trapped

I have a 2017 Buick Envision and here are some of the problems I've had with it. First off an issue I had was when I would change any of the climate settings there is a screen that appears on the radio display itself and it shows you what settings you have changed. For some reason that screen started to gray out. It got to a point when it would be gray all the time. The dealership did fix this issue after 5 visits because they replaced many things until it was finally fixed and I did not have a good experience with them. My second issue is that my fuel gauge seems to be faulty. After filling up my gas tank and stopping at the first click I notice that the gauge is not at the full mark. Its actually half way between the 3/4 mark and the full mark. Even when I've waited 30 seconds and continue to fill until hearing the second click, the issue is still there. I'm thinking a faulty fuel level sender unit. My third issue is that there is water that is trapped inside the doors until they are opened. Another user has mentioned this but there was no update on their post. This will definitely be a problem in cold weather because this water may freeze inside the door and cause problems. With everything going on with the G.M strike I've been waiting to take it in because I know that parts are definitely not easy to find.