Strange issue with Sentora I really need help

Hi all, I am new Sentora guy. I catch up with these problem nearly a week to solve but not success, so I must come here to need your help.
I have an AWS EC2 micro free and install Ubuntu 14.04 and Sentora as interface of website. First, it run seam ok for some months but my site suddenly dead without any access to http://panel.aucospa.com (IP neither too), ftp connect ok, file on puplic_hml still existed but Sentora bum. I connect via ssh ok and I try to restart apche2 and mysql but they still dead, another try to restart vps but no hope. I also check dns, domain status all OK.
What should I do now ?, I need some experienced on this issue.
Here a screenshot was capture I checked status of services on VPS


Disk space free OK

Thanks so much!