I had a problem like that, which turned out to be caused by pocket lint stuck in the USB-C jack. A bit of digging with a toothpick (I had to split it a bit to m

I had a problem like that, which turned out to be caused by pocket lint stuck in the USB-C jack. A bit of digging with a toothpick (I had to split it a bit to make the end small enough) got it out and after that the connection was very secure.