Error: Hold timer expired

[mx.avanttel.ru]

hello my friend, all the peers lose their connection at once, at 
different times, the server of 1500,000 networks and 3000000 routes, 
where to look for what to adjust, I ask for help, the server itself does 
not fall, the service does not fall either



]
Feb 27 05:02:45 bgp-01 bird: bgpMSKIX: Error: Hold timer expired
Feb 27 05:03:29 bgp-01 bird: bgpRFET2: Error: Hold timer expired
Feb 27 05:03:36 bgp-01 bird: bgpGLFW: Error: Hold timer expired
Feb 27 05:03:40 bgp-01 bird: Kernel dropped some netlink messages, will 
resync on next scan.
Feb 27 05:03:45 bgp-01 bird: bgpKOMP: Error: Hold timer expired
Feb 27 05:03:58 bgp-01 bird: I/O loop cycle took 5094 ms for 6 events
Feb 27 05:04:29 bgp-01 bird: bgpZap: Error: Hold timer expired
Feb 27 05:04:44 bgp-01 bird: bgpSAL: Received: Hold timer expired
Feb 27 05:04:56 bgp-01 bird: bgpRKN2: Received: Hold timer expired
Feb 27 05:04:56 bgp-01 bird: bgpFIT: Error: Hold timer expired
Feb 27 05:05:02 bgp-01 bird: bgpGLIX1: Error: Hold timer expired
Feb 27 05:05:05 bgp-01 bird: Kernel dropped some netlink messages, will 
resync on next scan.
Feb 27 05:05:16 bgp-01 bird: bgpRFET1: Received: Hold timer expired
Feb 27 05:05:19 bgp-01 bird: bgpRKN1: Received: Hold timer expired
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