RT-AC3100 Slow Download/Fast Upload.....Merlin FW...

I'm on Suddenlink 200/20. For some strange reason I can't get my AC3100 to behave. Plugged into the modem my speeds are fine, but off of the router, whether I'm wired/wireless, I can't get past 1 or 2 down. I can get 20 up all day long using either method. I've tried rebooting, resetting, etc., but the modem and the router to no avail.

I was on Merlin 380.63_2 yesterday, and through some miracle I managed to get the right combination of rebooting and resetting the right equipment in...

RT-AC3100 Slow Download/Fast Upload.....Merlin FW...