So I was playing on Experimental, Server: DE 2-0.
Doing nothing special, just looting some buildings. Suddenly my character started to float around, similar to what we experienced on Stress Tests when they crashed. I coudn't open doors, but could interract with items from inventory. When I logged out the server was up and with High popularity, so I simply rejoined it and the problem was gone.

Video: https://youtu.be/rLYBe4KDHxE
Date: 12.09.18
Time (CET): 22:46
Server: Experimental DE 2-0