Hey, I use Hyper-v 2025, PVS 2402 CU3 server and target, VDA 2507 CU1 with Windows Server 2025. Stability was great until I added more users. 8 users for a 8vCPUs, 45GB of RAM, and 40GB WC VM. Dell from 2025. It works but a few times, the VM becomes unstable (can't logon, user on the VM seems to work, I had Teams constantly restarting once, OS pausing Teams), when logging as local admin, the explorer doesn't load, half broken VM. Can't reproduce so far. Memory is quite high, 80-85%, pagefile is like 6-10GB. We suspect memory but I load tested one and it's stable even at 98% usage. vDisk is almost up to date, we have CU2603, getting a fully up to date ready. Strange, I wonder if it's W25 being bad at multi users with RDS/users. Same infra but W22 with VDA 2402CU3, same AV, etc. and no problem. Any idea? Thanks

Fslogix in use?

OFDC only, UPM file based for the rest.

Interesting, I generally try and not set any API hook reg keys if I can avoid it. Can you run a procmon to ID what's writing heavily to the page file ? Not manually amended a page file in many years

Thanks! Indeed I didn't have to do it until now. Still trying to identify it, not so simple. Trying also to apply CU2604 but I'm running into a PVS issue 🫠