Evren Gürsoy UYSAL

Hi all, I have a mesh system with 2 Extras and 1 Extra DSL. 2 months ago my extra dsl updated to 3.9 and my problem started. My bandwidth slowed down by %50 and my ping increased to 50-60 from 5-7. I couldn't play games. So I tried my old modem. It was ok. No problems at all. I used ethernet connection to give internet access to my mesh system. I have been using this setup since then. I contacted to the support and he told me that my connection has some problems. I couldn't understand because my old modem works just fine. He ask me to try keenetic modem on a different VDSL line. I tried it on my friends'. No problems at all. Weird. BTW support guy tried different firmware versions. But the problem persists. Do you have any experience like this? My keenetic extra dsl doesn't like my connection:D