Ideas
I have tested it for several hours and I'm not having any VRAM leaks and can play a lot of consecutive Conquest rounds without any stuttering or need to restart the game on all maps once I installed only the bare 5Gigs "Battlefield 6 Multiplayer" without the "Multiplayer HD Textures" and I have seen a couple of other users online (Reddit/Steam...) who reported applying this "fix" with the same result, so my assumption is that there might be some issue with this HD texture pack causing the memory leaks, as with it installed, the game was only playable on Low settings.
My CPU is 10700KF with the 4070 TI and with everything Ultra the game runs butter smooth 120fps with the FG on and DLSS Performance due to my CPU being a bit older to compensate the bottleneck, well the Overkill settings struggle a bit and the framerate drops between 80-90fps, but it still feels more stable and playable when compared to having the HD texture pack installed.