CRS loss packet

Hello, I have a network deployed two Mikrotik CRS. Each is completely different part of the network. On both versions are 6.12 If I put a higher version must be 6.20 so strongly increases packet loos on the charts in sight. In version 6.12 is much better, but there are also some packet loos. Previously, there was instead CRS L2 switch from TPlink and it was totally without packet loss. Anyone have a similar problem?
Packet loss is not so strong, but does occur.

The problem was solved with MikroTik suport, but always without result. It has always happened, and that I should have a problem down the road in cabling, but this excludes many times I checked, and when it was used switch TP-link problem immediately disappeared.

Yes, we have the same issue. See also http://forum.mikrotik.com/t/huge-packet-loss-on-crs125/85331/1 http://forum.mikrotik.com/t/packet-loss-in-crs125-24g-1s/76451/1