ECMP проблема.

У меня MT 2.9r7. У меня проблема, когда я скачиваю большие файлы через www – скачивание иногда прерывается, но не всегда. Вот моя конфигурация:

/ ip address
add address=192.168.10.1/24 network=192.168.10.0 broadcast=192.168.10.255 interface=ether1 comment="" disabled=no
add address=80.zzz.zzz.196/27 network=80.zzz.zzz.192 broadcast=80.zzz.zzz.223 interface=ether2 comment="" disabled=no
add address=83.xxx.xxx.98/29 network=83.xxx.xxx.96 broadcast=83.xxx.xxx.103 interface=ether3 comment="" disabled=no
add address=83.yyy.yyy.98/29 network=83.yyy.yyy.96 broadcast=83.yyy.yyy.103 interface=ether4 comment="" disabled=no
/ ip route
add dst-address=0.0.0.0/0 gateway=83.xxx.xxx.97,83.yyy.yyy.97 scope=255 target-scope=10 routing-mark=ecmp-http comment="" disabled=no
add dst-address=0.0.0.0/0 gateway=80.zzz.zzz.193 scope=255 target-scope=10 comment="" disabled=no
/ ip firewall nat
add chain=srcnat out-interface=ether2 action=src-nat to-addresses=80.zzz.zzz.196 to-ports=0-65535 comment="" disabled=no
add chain=srcnat out-interface=ether3 action=src-nat to-addresses=83.xxx.xxx.98 to-ports=0-65535 comment="" disabled=no
add chain=srcnat out-interface=ether4 action=src-nat to-addresses=83.yyy.yyy.98 to-ports=0-65535 comment="" disabled=no
/ ip firewall mangle
add chain=prerouting protocol=tcp dst-port=80 action=mark-routing new-routing-mark=ecmp-http comment="HTTP" disabled=no