Ive tried everything including calling ISP and ASUS (who is currently pondering the issue). I have a few ASUS routers, most recently an GT-AX11000, a GT-AC5300, a RT-AC5300 and an older RT-AC3200. I have Fiber 1 Gig. and until within the past week was getting close to the 1 Gig on the wired connection thru my routers for both download and upload. Now within the past week or so I still get the 1 gig on download, but can only get about 10-60Mbps on the upload max on the AX11000, and both the 5300's. The AC3200 I get close to a gig on both. my Fiber Modem is a Zhone ZMID-GP0N-242A-NA,. Also when I direct connect from the Fiber Modem to the PC I get 1 gig both ways, and if I go thru only an ASUS Switch I have, 1 Gig both ways. If I can get the RT-AC5300 back to how it was working, I will probably return the AX11000. All routers have the latest firmware applied also. I tried stepping back also with no luck now either. Any thoughts on this would be GREATLY appreciated.... Thank You and Good Day!