I have had the problem for a while that my internet is sometimes faster and often quite slow or not working at all. I would like to know why, and besides, it happens more when I play minecraft or have played minecraft I don't know why but once i have played minecraft, my internet feels useless afterwards, hope someone can help me.
This can happen if many people from your area, neighbors as an example, are also tinkering around a lot in the network.
I would recommend you to simply contact your provider (Internet provider).
Possibilities:
Contact your provider and ask there.
Go to the basement and take the panda off the line.
Alternatively, it can also be due to your laptop or PC.
It is best to do a speed test 2-3 times a day for 14 days e.g. On Speed.io
Write down the data then you write to your provider and send him the data and ask for clarification.