I do frequent uploads (and downloads) from my shared webspace from the office and from my home.

Until yesterday never had any problems. But since yesterday i get Timed Out errors for several files.
The strangest part is that some files are uploaded correctly and others are not.

From my house i can still up-download without problems but from the office i can't.

Of course this would sound like a local problem but i've spoken with my system administrator and he assures me that nothing has changed.

Is this a known problem or any ideas what i could have done?

I'm on a Iridium machine.
Website works fine and i only have problems uploading not downloading.