Hello

Looking for some help concerning my problem. I have 60 mb fiber internet for about a year and up to last week i didnt have a single problem with it.
But suddenly since last week i have been having trouble with it. I cant log into FFXI anymore, cant log into Rift anymore, WoW works fine and FFXIV does let me log in, but the connection does not seem to be stable. The S in the upper right corner keeps going down to 7 every few seconds. I have contacted my isp and they say that everything is working as intended on their side.

Does anyone have an idea what the problem could be