Irregular signal disturbance on TV since the internet became available

Hello everyone, our TV irregularly loses signal. The screen is black with the message "no signal." It usually occurs rather at the beginning and not every time it is used. It only happens once during use. To solve the problem, I usually have to switch once. There is also no signal then, but the reception "then returns."

What is strange is that we had no problems for 5 months (moved into the new building). It started pretty much exactly on the day we got the internet connection in the house.

Could this somehow be related?

We do not have internet TV. All cables (power, TV, internet) go up as a bundle in a corner of the utility room to the distribution box.

TV comes via cable, right? And what technology does your internet use? I know something similar from the past with SAT reception, where some transponders were on the same frequency as WLAN and DECT operates (2.4GHz). That often caused interference. I don't know how it is with cable, but maybe try turning off WLAN and – if available – DECT as a test.

We have TV satellite reception.
Internet comes into the house via fiber optic.
All technology converges in one corner of the utility room. Everything enters the house there, and in the corner hangs the distribution box, as well as the router, switch, armored box, etc.

I am also familiar with the sporadic phenomenon, but I haven't dealt with it yet, television is not that important - unless it's the [Darts World Championship]. In my opinion, it is due to the Telekom box, which was quite inexpensive with the house connection and requires an internet connection. It sometimes disconnects.

I also know the sporadic phenomenon, but I haven't taken care of it yet, as TV is not that important - unless Darts Waschmaschine is on. In my opinion, it is due to the Telekom box, which was quite cheap with the house connection and requires an Internet connection. It sometimes cuts out.

However, I have SAT reception and do not use Internet TV. The TV is connected via LAN cable.
If I recall correctly, the error only occurs with SAT reception. Netflix runs perfectly fine.

It is the same for me, same setup, same error pattern. TV signal comes via SAT with 2 LNBs, as we also like to watch BBC. The signal is processed by the Telekom box, where HD is also enabled. Then it goes to the TV. Netflix is unproblematic - also via the Telekom box.