Hello,

After switching from my older DLink to TP Link Archer AX73 v2.0 I have very unstable Internet connection, whether I use WiFi or Ethernet cable connection. 

I tried selecting different channels, different channels widths, having easymesh option on/off or NAT UPnP and DMZ. 

It seems better after disabling NAT UPnP and DMZ, but still it is bad. No problems like such with DLink dir 825. I switched to Archer to have better signal at top floor.