Both. We've used our own servers first. After noone of us was able to provide a "working system", we've switched to an official RR-Server (DTM 2015, Hockenheim) and had the same issues. In the past those issues happened occasionally, but they were usually limited to a single user, but since the last patch it is just nearly impossible to have a race without problems. Imho there is a bug somewhere in the netcode, which was already there in the past, but after the patch it's showing full effect. But that is just my opinion without proof. For example, Friday before the patch we had a race at the Salzburgring with the P2s. I was lobbying the game myself at first, but we had to switch to another server, because some of the players were jumping around. After switching to another players "Raceroom Dedicated Server" all worked fine. And now we have those problems always. We did some testing yesterday with five RDS hosted by different ppl and the above mentioned official server. Always the same issues!