Exact same problem.
The leak itself is somewhere in the AMD drivers, using poolmon to check on all pool memory will result in a tag that uses all the memory (in this case "MINI"), when I completely deleted AMD drivers e.g driversweep, this tag was comepletely gone. BF4 could still be the issue causing the leak to happen though, also seems that it usually happens during map switch.
I could play for an hour or two just now, by trying a different method this is what I did:
Start Battlefield and play some Team Deathmatch (fast map switch)
wait untill the leak starts happening (just by keeping an eye on task manager and checking non-paged pool. usually leak is noticable when this goes above 200MB)
close BF4
start a game of your liking.
Can't be 100% sure if this works as I didn't have time to test it out further / longer but I will tomorrow.
also sys specs:
i7 860
XFX AMD Radeon HD6950
8GB high speed RAM
