Hello All. I could not find a post about a similar problem in the internet forums, so apologies if I'm repeating a previous thread. I'm also not particularly computer savvy, so bear with me ^_^

At my office I use an ethernet internet connection and a Mac Mini, OS X 10.8.3. I lock my computer screen when I am away from my desk. After returning to my computer and unlocking my screen, when I go to use Firefox, I find the Internet is no longer connected. This happens regardless of how long the screen has been locked, even if it's been locked for only 5 mins. I have to hit "refresh" about 10 times and then the internet reconnects and works perfectly.

Does anyone know how I can fix this problem?

Many thanks in advance!
Burning Ember