RPC error after boot scaning. The problem solved itself. Why?

It is not a very important, or at least urgent, question, but here it goes…

I scheduled a boot scaning (showed no infection) and after it, none of the resident providers iniatialized and finally Avast showed up the classic RPC error. I went to the FAQ and went to check the conditions and make the procedures indicated at the FAQ. The Avast anti-virus service was running normally. I reinitialized the pc. Same problem was still there. I rebooted again. All the things normalized.

I’m happy but curious…What is it? :o

Gremlins… It never happened to me while running boot time scanning.
Do you have any other security program that could interfere with avast?

Well, it was after.

I have Windows Firewall (never interfered) and Spyware Terminator without resident protection.