More than one computer connecting

Hi All

Got my MBL a couple of weeks ago. Noticed this morning that Time Machine was not backing up, saying it could not connect. Found that when I disconnected another computer which was playing from the itunes server, that I could then connect on the first computer. A bit more research revealed that more than one computer can connect and play from the itunes server at the same time, but when one computer is on the itunes server, the other cannot connect through finder (I have Macs and Windows computers). Just says that I should check the IP address.

Uh - Oh, just found that the problem has resolved itself…

What happened? I’m puzzled. Has anyone else had this?

Problem occurred again…

I resolved i by resetting the drive. Am I going to have to keep doing this?