I've checked that my two CRS226-24G-2S+ connected by fiber (both with SFP+ modules in first port SFP+) do not work corectly. Every few hours SFP+ modules hangs (no link - led off) and SFP modules need to be unplug. Unpluging fiber connector do not help. Both CRS have 6.28 RouterOS and are upgraded to newest firmware. Our link length is about 400m. Same SFP modules works perfect in our CCR-1009 link length few meters.
Currently I have moved SFP+ modules on both CRS to second SFP+ ports. Will see what will happend.

Anyone have similar experience?

Moving SFP+ modules to ports 2 in both CRS226 solved my problem.