I think your session is being restarted every 180 seconds, because your 
keepalives aren't going through. It may happen it you have low MTU and high MSS 
size for BGP packets, your updates can't get to neighbor and they get queued 
and keepalives are standing behind updates packets 

You will see it with command sh ip bgp neighbor X.X.X.X in the top something 
like

Keepalives are temporarily in throttle due ...



Check mss size 

sh ip bgp neighbors X.X.X.X | i Data

and compare it to mtu on link (plus 40 bytes)


Why it was working before? Maybe MSS was lower on old soft? 
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