CCR1036-12G-4s trouble with one of interfaces

Hi Mikrotik . Lately on my CCR1036-12G-4s trouble with one of interfaces, he spontaneous stopping transmit packets. Trouble solv if the special script automaticaly, firstly disable this port and there and then enabled. Problem arises on any interfaces, if traffic in clients side. Supout.rif is attached.
supout.rar (414 KB)

Both sides CCR1036 -12G-4S connected to Cisco. On Uplink side - Catalyst, on side Downlink - SCE2020, both links use the SFP modules, configuration of ports distinguished only parameter - Auto Negotiation. On uplink side this parameter is on. On downlink is off. Both ports sets on 1Gbit/sec. Transmit stops only on downlink port and never on uplink. Changing optic connection on copper - nothing do for solve problem. I believe the problem arises because of the large number of packets on the interface, the more packets, the higher the probability of interruption of transmission of packets. Up to 40000 of packets per second in both directions, the problem occurs less frequently than in the same 100-130 Mb / s but when the amount is more than 40000 packets.