I'm still running into the same issue. Doesn't appear to be a problem when using my Rift, but only the Quest 2.
I'll be getting a solid 120 fps and suddenly... POOF... it's like my display is hanging on frames. The game and PC say I'm still getting a great FPS, but the view in the headset just hangs on frames. Free memory goes from 200-300MB to 0-10MB. I've been told this is what a memory leak looks like.
The Quest 2 is unusable, and my performance seems great until it just runs out of memory. I've tried about everything under the sun and every combination of graphics settings in-game, as well as in my nvidia control panel.
Only with DCS which makes me think it isn't an Oculus issue.