AC-68U with Merlin 380.69 slow upload

[good2all]

I am experiencing a strange problem, ac-68u with merlin 380.69, very fast download (up to 90Mbps) but very slow upload (only 1.2Mbps). I tried to update the firm ware to 380.70, but the newer version gives me very slow download(5Mbps) and upload(1.2Mbps). All test are done with wired connection. QoS is disabled, can't think of any changes recently.

Any help is appreciated.

 

[appleseed]

I would establish first: Is your ISP cable, wireless, dsl, satellite? If cable, check/compare your signal log: http://www.dslreports.com/faq/16085 in case of problem or routine maintenance.

Second, are you performing a factory reset after each upgrade? https://www.snbforums.com/threads/faq-nvram-and-factory-default-reset.22822/