I've got a couple emails last night regarding "HTTP 500 Error". I am not aware of any issues with the server. However I did receive an email today from HostGator (the web host).

The servers are being updated with a new version of "CPanel" (the administrator dashboard). This may cause a few intermittent down times, typically no more than a minute.

Update: The server had some updates; Let me know if you're still seeing some hiccups (error 500) during this weekend.