ya i googled the problem first before creating an account here and wrote this topic and nothing found, maybe its only a local problem for a small amount of partial routers for EU or even only for...

@terziyski thanks for interesting my problem as you can see no one from tp-link support on this forum not interested of my problem, and I a little regret that i bought tp-link machine again because...

no its bug of this router for sure because i talked on this subject/bug with Polish support on info-line telephone and they said me will be fix this in future in new firmware update no, no one want...

I dont have any IoT devices and Mesh or something like that :) I had before Archer C6 but older version V2, and on it wasnt this bug

its not with my devices, i have only one PC on LAN and one PC on wifi

i did factory reset and didnt help