Video lag on BlueROV

Hi!

I have a 1-2 second lag on QGC after deploying my BlueROV, and I can’t find the answer to this problem. When I start the system, everything works fine and there’s no lag. If It’s driven in a freshwater pool where I’m standing close to it, the lag does not appear, but as soon as I put it in saltwater and drive 5-10m away from me, the lagging starts. I’ve tried with two different computers, which does not solve it, and I’ve tried Rebooting/restarting everything (on land) after lagging starts.