Unity bug?

For about the first 5-15 minutes of using unity the inspector works fine, but after that whenever I change something, the inspector goes blank and I have to reselect the object. It wasn’t to annoying at first, but it gets annoying when your editing a tag and have to go to the tag manager over and over again (when ever you type a letter in it will go blank).
(Just incase this wasn’t clear, this happens with no matter what I am doing in the inspector)

If I quit unity and go back it will work for another 5-15 minutes.

Is this my fault, or is this Unities fault?

That’s a bug, log it please (via the Help menu in Unity).

Ok, done.