hi. oke. all is clear now. it was the cable which appears to have a bad contact and changes when i hooked it up to the c7 router which is on the table and me pc is on the ground below the table. so...

hi, thanks for you respons. "What is the current network topology? Is it internet cable--Main router--C7--clients?" if you main how i hooked up the acher c7 on the main router "technicolor TG389ac"?...

I have same problem. speed only 92 MBps on LAN and wifi and should be 600 MBps . when i reset the router to factory it is give speeds 600 mbpx but next day only 92 mbps according to speedtest onkio...