Last week some fellows were digging a hole in front of neighbors house.
“We are repairing a cable its a fault elemination.”
Result : all went offline here for a few hours.
Then it worked again.
BUT a few days later we were offline again.
I couldn’t ask the neighbors because they are all on vacations at the moment.
I am the old watchdog .
Ok I thought the diggers had been coming back and “repaired the cable again”.
Waiting, the router tried to get DSL, nothing happened.
At the and I called telekom.
Great, a very nice fellow cared about this issue.
I told him about the diggers.
He knew about the issues had been caused by them,
sohe tested the connection.
Was fine.
Ok lets reset the router
(old one from the flea market what else 
)
BEST : A hard reset with the paper clip
(Why did they stop to add this feature on modern devices???)
Nothing happened
We decided “defective router”.
What to do?
I remembered, have another one in the cupboard!
GREAT!
Ok lets take out the this router an check it.
(Same model, from the flea market, were else from 
)
Worked, perfectly. 
Seems I have to look for a “new old router”
At the flea market were else.! 