Wifi/DHCP issues

Hello,
I am a little concerned about my setup, as in the evenings imparticular, I have always had wifi connection problems. At first I thought this was understandable, as I have no choice but to keep my PC on the opposite side of the house to the router (and use a wireless connection not ethernet), so have purchased some wifi extenders. These seem to be working fine, however they have only aggravated the problems, despite me getting full signal from the router constantly. Whilst I remain connected with full signal, the speeds drop to 0 mbps every few minutes, and stay that way for a minute or so before returning to the correct, full speed. In event viewer, I also get the following error messages:

Event 5005, Netwtw14: Intel(R) Wi-Fi 6E AX210 160MHz : Has encountered an internal error and has failed. 

Event 5002, Netwtw14: Intel(R) Wi-Fi 6E AX210 160MHz : Has determined that the network adapter is not functioning properly.

Event 5007, Netwtw14: The description for Event ID 5007 from source Netwtw14 cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event: 

\Device\NDMP2
Intel(R) Wi-Fi 6E AX210 160MHz

The message resource is present but the message was not found in the message table

These errors seem to indicate the issue is internal, so I have done clean installs of drivers, updated drivers and rolled back drivers as suggested online. I have rebooted the PC countless times, forgot the network and reconnected, rebooted the router, and tightened the antennae on the wifi card (intel ax210, wifi 6e). I have also been through the windows 11 troubleshoot for networks, which when the wifi was playing up stated "The DHCP server is not responding". I don't know loads about networks, but that - and the fact that problems are almost always in the evening - suggests the problem could be external, despite the error messages pinning the blame on my wifi card. Does anyone know what the problem could be? Do I need to change my wifi card or router? Or am I just still too far from the router?

Many thanks!