Hi

Archer C5400 v2, FW 1.2.5 Build 20190411 rel.52981(4555)

Connection plan is 500/30

Using mutliple PCs and devices all supporting 1Gbit wired connection or at least more than 500mbit

After working just fine for about 2 years, the router started to completely lose download speed via wired connection and goes about half speed on wireless. Upload seems unnaffected weirdly enough. No matter what i tried - reboots, restarts, factory reset, change ports, use an Intel Pro/1000 PT dual port adapter instead of the onboard ethernet connectors, new cat6 cables, nothing helps, sometimes after some of these changes the speed comes back up to about  220-250mbit, but in matter of minutes goes back to like 1mbit ...

Cant say if this would tie to some of the firmware upgrades, but since a roll abck seems to be impossible i cant try that.

Needles to say connecting directly to my modem from the ISP gives me the full 500/30 both wired or wireless.

I've seen countless similar threads in this forum, but didnt manage to find and actual solution. Is there an actual working firmware or is TP-Link just abandoning customers? I mean this is not an entry level product, one would expect more...

Thanks