I have RB2011UiAS-2HnD-IN running dual WAN. I am using mangle to mark IPs 10.10.10.180 to 10.10.10.200 as "to_WAN2" and all the rest of IPs as "to _WAN1". Everything works fine when fasttrack is disabled. When it is enabled, there is only one IP (10.10.10.181 - PlasyStation 4) that slows down dramatically. Normally PS4 shows 25-30 Mb/s download and 5-10 Mbps upload on its connection test. When I turn fasttrack on, it drops down to 100-200 kbps download and 20-50 kbps upload. The rest of the devices assigned to WAN2 works fine. It's only the one that shows problems. What can that be?