I am unable to update my products.

I get the following error message:

The connection was reset.
The connection to the server was reset while the page was loading.
The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer's network connection.
If your computer or network is protected by a firewall or proxy, make sure that Waterfox is permitted to access the Web.

I get a similar message from Chrome and IE. I have spoken with GoDaddy and they assure me there is no problem with the server. This error only appears when I try to update or add a product. I created a new product yesterday at 12:16pm (timestamp from the image upload), without a problem. But, 3 hours later, when I tried to add a new product, this error appeared. I can create/update coupons and users, just not products. I have only been working in the Admin portion and have made no changes to any php scripts (date stamp will confirm). My Admin access information is attached.