I have 3 crs125-24g-1s-rm with optical transmitters.
While I understood why links down and up (http://forum.mikrotik.com/viewtopic.php?t=80880) showed more serious problems.
1. Does not work on auto negotiation on ports sfp. Cost failed. Force change port to 10/100/1000Mbps not remove failed . Caption full duplex does not appear , it seems firmware is not working normal with the ports sfp.
2 . There are lags in the network. When the load on the CRSs cpu 10-20% and the total network load to 80Mbit ( All ports are slaves to one master) pings standart packet size between network devices connected to the ports of one! CRS and reach up to 500ms . That is, when I copy the file of 500MB with the laptop connected to the CRS, a neighbor from the server connected to the same CRS can not send a print to a network printer connected to the same CRS.