Radio/tape Cd Player problems of the 2015 GMC Terrain

Front passenger seat belt chime comes on when there is nothing on the front seat or almost nothing on the seat. This has happened at least 1/2 dozen times or more. I can be driving and all of sudden comes on. It can scare one esp 1st time. You don't know what is happening. I thought I blew a tire or door came open. My attention was everywhere but on 65 mph traffic on freeway. Breaks one's driving concentration. Independent of temperature. Other problem I have is lots of wind comes in on passenger door. It is not aligned properly. Gm has tried a couple of times with no success. Very annoying and hard to hear radio etc. . 3rd problem is navigation,communication center,it keeps disappearing. It is giving me directions somewhere and then just disappears and resets. It has been replaced once. It has gotten me stranded more than once. I am a senior who relies on system. When it disappears, I am not always somewhere that I can stop to completely reset and reenter all the information again. I feel that this is a safety issue. I was on hwy every time and most of the time not in a remote area but not in area that I could stop. In CA. There are many areas you do not want to get off the frwy at. All instances above happened in the city areas while driving. Service was done oct 2015. None of issues resolved despite attempt. All are ongoing.