Problem of server hangs proxmox 4.2

May 13, 2016
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Hello!
Faced with the problem of server hangs proxmox 4.2. There are two server configuration assembly in the same cluster. Periodically they hang completely. Proxmox installed a month ago on the new hardware, check memory and disks The logs record all come to an end at the time of freezing. How can I diagnose the problem?
M/B P8Z77-V LX2
CPU i5-3570