Roller goes on in the cold, warm off

Yesterday I was on my way home and all of a sudden he went out while driving. Not abruptly but stuttering and stuttering, like hiccups. Then nothing went on until he stood for a while I got him back on Kickstarter. At some point I could drive a good bit then the same game again from the front. So scooter at Ner forest entrance left and had to pick up. Today on the way home I wanted to try again. He spra. ng directly on with e-starter and could also drive again… then 4-500 meters further he started swallowing himself again and went out again. Now he stands at Ner other forest entrance and waits until I can pick him up tomorrow with the trailer. What could it be about? Would be grateful for the help…