Ports flopping on CCR2004-16G-2S+ with RouterOS 7.9

Hardware MikroTik hardware general
1

Hi all,
Last week I upgraded my CCR2004-16G-2S+ to RouterOS 7.9. Migration was fine and everything worked fine for a couple of days. But tonight I noticed that all ports flopped at one moment.
In the logs I see multiple ports suddenly reported as “up” (most of them have no “down” log record except for one) and I see the service beeing disrupted for couple of seconds. Here are the logs that relate to port status:

2023-05-17 22:44:21.825 interface,info gre-tunnel2 link down   ---> link over leased line
2023-05-17 22:44:23.946 interface,info ether2 link up (speed 1G, full duplex)   ---> link over leased line
2023-05-17 22:44:23.946 interface,info ether3-LEASED_LINE link up (speed 1G, full duplex)   ---> link over leased line
2023-05-17 22:44:23.946 interface,info ether1 link up (speed 1G, full duplex)    ---> main uplink
2023-05-17 22:44:23.946 interface,info ether5 link up (speed 1G, full duplex)   ---> internal link
2023-05-17 22:44:23.947 interface,info ether8 link up (speed 1G, full duplex) ---> internal link
2023-05-17 22:44:23.947 interface,info ether6 link up (speed 1G, full duplex) ---> internal link
2023-05-17 22:44:23.947 interface,info ether7 link up (speed 1G, full duplex) ---> internal link

Other network equipment connected to the same switches did not detect any flopping so this must be something related to Mikrotik device since it was the only one that had problems at that time. There was not significant traffic at the time when port flopped.

One interesting thing I noticed is that the problem occurred exactly 8 days after the upgrade. I have made the upgrade to 7.9 at 2023-05-09 22:40:38, at this time router was rebooted. and the issue with port flopping happened at 2023-05-17 22:44:21. I found this post where user has similar issue with port flapping every 7 days for him.

Does anyone else have this or similar issue?
I can’t do much debugging since this happened on production router.
On the router I have configured 5 VLANs and there are ~10 IPsec tunnels running. The same setup was running with previous ROS versions for the last year without such issues.

If this happens again I will downgrade to 7.8 and see if it repeats on this version.

2

I’m experiencing a similar issue, did you find a solution?

3

In the last three months the problem occurred only once, I didn’t change anything in the meantime.
I am now running 7.10.2 for the last two weeks, flopping did not happen on that version yet. I hope that it will stay like this. (I had 7.11 for couple of days, but I had to downgrade because of unstable IPsec on that version).