Has anyone else noticed that when you are in a dungeon or "inside" cell, for brief moments the game seems to think you are under water?

I hear the water sounds, the game even starts the "put weapons" away animation and then it's back to normal.

I had this with a completely unmodded game as well as with the mods I am running.

Anyone else have this problem or is it just me?

I haven't had this issue. Then again, I haven't really played much since the latest patch.

Maybe it's caused by a mod?

I can confirm that I also get this all the time when in the "cave" template style dungeons (especially ones with water in them). However, there is one thing the OP didnt mention (not sure if he has this issue as well) but when I hear the water sounds I also sometimes see a visible water line apear on my screen. It's so quick that it just looks like some blue stuff flickering on the screen. I have no mods. I play completely vanilla.

Also, after having played oblivion and skyrim for so long I can tell by the sound its the one you hear when you submerge or emerge through a water line. I'm almost certain that this is the sound. It almost seems like I'm clipping through the floor at times and hitting water underneath the map. I've seen stuff similar to this in other games. Just my hunch.