Sep 12 clients not updating automatically

Hi everybody,

I have about 2500 clients conected to 2 SEPM. Since a month ago I`ve got about 80 clients that dont update automatically.

It`s not a question of operative system, location, network variables. They just dont update and the computers next to them update correctly.

Usually, i change them from their original location to unmaneged clients and they updated in about an hour, now this solution doesn`t work.

I have clients with Windows Xp and Windows 7, 64 bits. The only message i get from the logs is, no new updates were available.

Any ideias?

Tahnks in advance