Well, I tryed help Idnet with this issue.I changed modem(hg612,billion 8800nl), tryed with different router (asus,tp-link,linksys), tryed different firmware or 3rd part like asus-merlin,ddwrt,tomato.Tryed opening ports,dmz,upnp.Tested in different time,days.Tryed reinstall windows, initialize ps4 with new firmware.Replaced new cable rj11,rj45 (cat5,5e,6).But still is problem with online gaming.Tested same game or streaming same video on sky with my friend and no issue.So I really dont understanding where could be problem.Only one problem is that on speedguide showed me mtu 1460 and is limited to this size.So I asked idnet if they can change my mtu to correct value mtu 1492 and then I can test online gaming and streaming again, so I eliminated the problem.Unfortunatelly idnet not fixed this mtu.Propably they dont know how to fix or they dont wanna help me.They said, that I can cancel contract.Well, I tryed resolve issue but if idnet ignore then what I can do more?