Currently my pool hasn't had the water changed again in a couple of years. It's starting to happen again. I dive beyond 2 ft and I'm done.
So it will happen with anything that dives. But when I'm at the local lake I can dive the same boat as deep as I can still see it and no problems.
I can't be sure 100% that this is your problem. But if you try another sub with a different radio and Rx and the same thing happens? I'd say yes.