[Solved] The browser does not load some pages, many applications are not running

Hello
Suddenly, without any interference, the browser does not load many websites, Skype and some internet-based applications do not work, some pages load and some do not.
This happens on all devices in the house, I restarted the router, checked if the IP addresses of the devices were not the same, I deleted the browser cache, I am not using any antivirus other than defender.
Previously, I did something with the ports on the router but it shouldn't be a problem because I did a factory reset.
ERR CONNECTION TIMED OUT
The problem is on my side or the supplier?
Edit
Sometimes it happens that I do not have internet at all, I check cmd for pinging with other devices but everything is correct, if I do not have the Internet, I restart the router and the Internet appears, but there is still a problem with loading pages

What is this router, what provider?

The supplier is ANFA
A year ago, I changed the router to TPLINK WR841N

Do you have some vendor device in front of your router?

I have a radio, so I still have an antenna

So the cable from the "antenna" instead of the router connect directly to the computer and check if it works.

I connected now from the antenna and the same problem continues, the same websites and application do not work as before

Then the problem probably lies with the supplier.

So no dns setting will do anything more?
Are there any other possibilities for me to have a problem?

Added after 2 [minutes]:

The neighbor also has the same supplier but he has no such problems

Since the same situation is unlikely after connecting the supplier's equipment directly.
You can post the topic in the section https://www.elektroda.pl/rtvforum/forum217.html after reading https://www.elektroda.pl/rtvforum/topic1044160.html

The neighbor also has the same supplier but he has no such problems

I wrote you what else you can do to rule out a problem with the system.

Now I went to win defender and found a lot of serious actions, a lot of exploits and trojans are listed

Disconnect the power supply of this radio from the power supply for a few minutes.

I did on a device where I had a Trojan format but now there is no internet on all devices
The error from dns is intertwined with the error that the microsoft resource is not responding

Added after 38 [minutes]:

Okay, the problem was with the provider, now everything is back to normal, I noticed that the external ip has changed

I did on a device where I had a Trojan format but now there is no internet on all devices
The error from dns is intertwined with the error that the microsoft resource is not responding

Added after 38 [minutes]:

Okay, the problem was with the provider, now everything is back to normal, I noticed that the external ip has changed

Added after 33 [seconds]:

Okay, the problem was with the provider, now everything is back to normal, I noticed that the external ip has changed