This morning C1 stopped hashing, check the pictures. Please advice

1. http://imgur.com/FhUtn2u">http://i.imgur.com/FhUtn2u.jpg" title="source: imgur.com" />
2. After 1 hour
   http://imgur.com/zoOrPZV">http://i.imgur.com/zoOrPZV.jpg" title="source: imgur.com" />

Miner continued working without any maintenance... strange for me. If anyone had this problem please advice what should i do next time with this kind of problem.