Intermittently loses internet via Wi-Fi?

Question

WiFi

Good day!
I ran into a problem that home Internet began to disappear over Wi-Fi, for example, when watching a video online. At the same time, the Wi-Fi icon on the phone shows that there is a connection to the router, and sometimes it disappears.
On a computer via LAN, the Internet works without failures.
Thinking that the router (TP-Link TL-WR741ND) is gradually failing (it is ~ 6 years old), I decided to replace it with TP-Link TL-WR841N.
But the problem hasn't gone away.
Where to dig?

Answer 1

I changed the awl to soap)
Most likely the WIFI 2.4GHz range is very noisy. Try changing the WIFI channel on the router, but this is a temporary solution. To date, the router must be selected with support for the 5GHz band.

Answer 2

https://habr.com/ru/post/506812/