I am having the titled issues with my internet connection. I have a cable connection with a Fritz Box 6660 modem, which has worked rather fine for the last 11 months (a disconnection or two at late night hours has been the only issue).

On 18.01.23, I lost my internet connection fully. It took 15 days to fix, and I was not informed of what the problem was or what has been done to solve it. In the end, internet came back on the first days of February, but since then I have experienced high pings and some disconnections. This has happened both while on wifi and while being connected directly to the router via cable.

I am providing a screenshot of a ping measurement tool that I did an hour ago. I have tried a few sites with the same results, and I am getting the same high ping measurements while playing different online games (even getting disconnected sometimes for this reason).

I fear the fix on the connection has been done poorly and resulted in this faulty service. What can be done to solve my issue?