It is something related to Frankfurt.( Where servers are located). If you go to testmy.net and on latency tab, you will see high spikes on their server also located in Frankfurt.
I went wild with this since September, ISP already has me on fast dial due to how much I called them, changed my router/modem/wires. Came with their laptop for tests, and all works fine on ISP side.
I live in Romania, have 1GB band, net is working perfect but the routing to servers is the problem.
Used google DNS, tried wired, unwired, used ping plotter, contacted support, problem is still there.
So if anyone finds solutions, please share.