System magically rebooting?

We have a Linux 7.3 cPanel server that keeps rebooting every
few days at different times, it seems random.


Here is the entry from /var/log/messages

Jul 29 21:04:31 cz wall[15988]: wall: user root broadcasted 1 lines (58 chars)
Jul 29 21:04:32 cz shutdown: shutting down for system reboot
Jul 29 21:04:38 cz init: Switching to runlevel: 6

What is wall ?

 

 

 

 

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