K1C: New Problem after replacing the hot end and Heat sink fan -

Hello,
i made a post in january because after replacing the hot end I got an error with the heat sink fan.
We bought this machine end of november.
We broke the cable of the hot end while changing the nozzle. Thats on us.
So we bought a new one and replace it. After the heat sink fan made problems. I reconnected everything but ultimately I had to replace the fan as well.
So after replacing it, did fix the problem.
But now I cannot really print. It prints like 10 mins. then is stopps extruding.
I was just printing PLA filament. I read you should open the top while printing. It could be too for PLA.
Note: before I didnt need to open the cover to print anything. Everything was printing fine.

I removed the cover while printing. This time it worked out. So I tried to print the next piece.
This time it stops extruding after 2 mins. I opened 3 times already today to check and to remove the filament.
Nothing is stuck in extruder. All gear moves. But I feel like is not moving smooth enough for my taste. The nozzle is new.
I start to run out of idea so I asked the creality for help.
But anyone has any ideas?