BigMak

I am having issues with my trucks theft deterrent system. Its been happening about 3-4 per week. Sometimes while starting truck it cranks for a second then stops and service theft light comes on. Then i try again and it starts. Then sometimes it just makes a clicking sound snd light flicker like a dead battery but its fully charged and putting jumper cables did nothing same clicking. Sometimes remote start wont work and when it does my radio preset is gone and displays i think 87.9 on radio like battery disconnected. Any have this issue. Dealer has had my truck for 3 days cant find it. Can it be that g218 ground issue. Help please