Name of Internet Service Provider (ISP)
German Telekom

Country of residence
Germany

When does the problem occur (e.g. only during specific times such as in the evenings?)
Throughout the whole day

Frequency of problem (e.g. every 2 minutes)
Between 5 seconds and a minute

Game content in which the issues occur (e.g. dungeons, trials, certain areas)
Everywhere, including dungeons


Basically, I get a bunch of packet loss on all European servers, the NA servers are perfectly fine for me. Lagspikes of 2-10 seconds every ~15 seconds, players warping all over the place constantly, same for mobs. During those lagspikes, my own actions somehow get through to the server, other players can see me acting.
That all started about 2 days ago, no change in hardware, other games run a stable connection.