Timeouts in the 5 min. Tact?

I have a continuous internet connection with full bars and the speed test also shows a 6 ping. Nevertheless I have timeouts in all online games every 5 minutes. Also on Discord or Teamspeak the connection often breaks and streams on Twitch get stuck all the time.

We have the problem on every device in the household and have been for 2 years. Yes. 2 years ago I hardly used the internet, which is why I didn't do anything. But now it sucks and I just have no idea what to do about it.

Vl. Can anyone help me?

Hey SimonUnge311,
are we your internet provider by any chance?

Two years is really a long time. Do you only have problems over WLAN or also over LAN? And did you ever give that technique to yourself for a test?