The 4331 is WiFi6, (WiFi AX), so the Wifi capabilities are going to be the same. Are you using 2.4 or 5ghz? Remember 5 ghz has half the range of 2.4, and is more easily blocked by any solid object, (to include walls/floors/ceilings/furniture). So you may want to try the 2.4, even though it's slower, it DOES have 2x the range. Also remember any number of devices use 2.4 as well as 5ghz. Cordless phones, microwave ovens, bluetooth devices, cordless kb's and mice, Game controllers, baby monitors, garage door openers, and radio controlled toys, not to mention everyone with a router nearby.