How to solve the problem with the loss of dns on the router?

Question

Iron

The Internet periodically flies, wifi writes "no access" diagnostics gives "dns error". And apparently it's not the router, since I just changed (took asus ac51u) and the same song. In this connection, dear experts, attention to the questions:
1) Are there any methods to deal with this error? Or a more accurate diagnosis? (we are talking about what would not appear. For there is a treatment, I just reconnect to the wifi network and everything is OK)
2) Can this be caused by a static ip (on a specific computer)? The rest are dynamic and I don’t see such problems.
3) Can software like OpenServer affect this?
4) can the provider be the culprit?

Answer 1

Write hard dns everywhere like 8.8.8.8 and 8.8.4.4, well, or Yandex or someone else.
- In the settings of the router
- In the DHCP settings of the router
- Nakraynyak in every computer (although this is already wildness)
Should help.
PS It seems to me that you have two DHCPs on the network.