Autonomous RC car loses gps connection when starts the route.

Hi everyone I need your help! I don't know if this is the right place for this post, but I'll give it a shot. My thesis is to write a manual for this particular rover and also make a "test drive" with it. I drew the plan in mission planner, changed the necessary parameters and det the rc to auto. Every time it starts with here 3 being solid green and then stops and the colours are flashing yellow and red which I think it means that it lost connection. Then it gets solid green again but i have to switch it back to manual and then auto in order to start again to move and then suddenly stop. I want to clarify that it doesn't stop each tme after a specific amount of time, but it's random. I tried one suggestion which was to raise the here 3 up to 15cm (in the photo is 14.5cm) but once again it didn't work. I should note that lidar should have worked also (by work i mean it should have meade the rc to avoid obstacles) but it doesn't and i'm curious if this is causing the problem. Anyway don't hesitate to ask every detail you want in the comments, I will appreciate all the help you can give me!