No management access !

Hello,

I have a weird situation with one BigIP. the GUI is simply not accessible (browser timeout) and with SSH sometimes I get the prompt bellow (not normal as I'm connecting to the management IP, not the AOM). last time I had to reboot the box to get back to a normal situation, but it seems to come back after some time. this box is part of a device group and it seems to be working fine (I can sync configuration and all IPs are reachable with ping). any idea what could be the problem ?

login as: root
root@10.192.124.12's password:


Press Enter to deactivate another concurrent session...


--- Press ( for AOM Command Menu.

[root@bigip2:Standby:In Sync] config 
[root@bigip2:Standby:In Sync] config