hi,
I just replaced ccr 1036 with ccr 1072, after 2 days of uptime It stopped pinging all the connected routers. I could see them in neighbours but no ping. As i’d static routes with different distances added which made all my static routes invalid because check ping was enabled. Reboot resolved the problem. CCR 1036 had uptime of 210 days before I replaced it with 1072. I feel a clear bug in fasttrack rule. I added a rule on forward chain to fasttrack which i deleted it but dummy rule was sitting on the head 
another rule to accept established, related both were disabled. Sent the support file to mt
Hi
That sounds a little like this?
http://forum.mikrotik.com/t/ccr1072-stops-responding-to-traffic-via-some-sfp-cages/93660/1
no not like that.
- It is connected to 10g switches
- Data was going fine but pinging stopped.
services were affected because my routes had check-gateway=ping enabled. which made router think the gateway is unreachable.
Explanation is one of the link got down and it had redundant routes. Routing for that link was affected.
Other links were working fine
Please make a supout.rif file and email support@mikrotik.com to open a support ticket.
normis < already sent and interacting with them. they are doubting ping utility crash
it crashed again 