Unjustified crashes from the server. HELP!

[4really]

I'll try to be brief... sorry for my English.

For several months everything was normal. logged in - 2fa - played.
At the moment I have a problem with unreasonable crashes from the server. (as if the server crashed) every 5-10 minutes... this happens systematically, but at different intervals. I reinstalled the client, removed all the old addons. How to fix this?

[angrylol]

It's basically same as saying "it hurts" and then refusing to explain what exactly.
Crashlog should give you at least some vague info.
How are your temperatures? It's WoW specific or all games crash? Update/reinstall drivers. Try to store client on another drive to see if that helps. Use something like Largeadress aware for your wow.
Did you tried or checked any of these generic things?