I looked everywhere but could not find the solution, my i3 inspiron broke down so I got my hands on a latitude e5420, since it had a better cpu, and installed windows 7 pro on it. it suited my school needs and better performance on some of the cpu intensive games i play, the problem is the wifi, sometimes, "especially during games or an online test" the wifi would limited, or the dns would stop responding, so ill have to disconnect and then reconnect to the wifi. I already changed the router, updated the driver, and changed some settings is there anything else i can do to fix this issue? It has become especially annoying since this is the time of quarantine.

Bios a14(latest bios for this computer i can find)

asus 802.11n network adapter

YES, I did install all the drivers in the correct order with chipset being first.