Explorer stability

Right now i am running build 7000 on three computers: a desktop, a htpc and a laptop. All three computers are running fine, except for (file) explorer that ceases to function once in a while.

What happens is when i'm browsing through some folders, it won't open the folder and instead the progress bar goes on foreever. After that i cannot open another folder and i can't shutdown as well (it won't logoff). All three computers have this same problem.

I use windows update and i should have the recent stability fix installed (i didn't notice a difference). Are there more people with this problem? Is there some way to fix it? Or do i just have to wait for rc1 :) ?

its build 7000, its fixed in later builds (or well at least greatly reduced). While in build 7000 i had at least 1 or 2 explorer crashes/day, now i think i got 1 total in 4 weeks of using builds 7048&7057.