I'm having the same issue since my quest 2 turned off because of low battery yesterday (also got ht e v25 update like 2 days ago), after a reboot it always takes a minute for the quest 2 to regain tracking (I've tried multiple rooms in my house that worked perfectly before). Also when I make the guardian boundary it feels really choppy, like I have low fps. After it has regained tracking it seems to work fine, but it's really annoying. I also got the update yesterday so it seems to be the cause.