I know this is kind of a really old thread, but I'm having this same problem with online play.
Single player I don't have this problem at all, just online play. I have RenX installed on three computers and they all have this problem.
I've attached a few videos to show what's going on. I've tried using my phone as a hotspot to rule out internet issues, but it happens through that as well.
Renegade X (64-bit, DX9) 2020-04-17 11-29-49.mp4
Renegade X (64-bit, DX9) 2020-04-17 11-18-18.mp4
Renegade X (64-bit, DX9) 2020-04-17 11-20-23.mp4