Something is interfering with my computer which shuts off the internet between certain times. It occurs at the same time each day, and no other computers are affected, so I suspect someone has installed some sort of child block on my computer (or router?). I want to know what I need to do to find out exactly what's happening and remove the cause.
(In case it needs to be said, I am not a child, and there is no legitimate reason for someone to place such a block on my computer. Furthermore, the circumstances suggest this is an act of malice, so asking the person responsible to fix it will not work.)
My computer is running Windows 7, and I have an administrator account.
Below is a list of diagnostics I have tried so far:
The internet works fine on other devices, so it's not a case of that being down.
I have tried taking the ethernet cable from a computer that I know has internet, and plugging it into mine, but my computer still doesn't connect. Likewise, if I plug my cable into another computer, the other computer still connects fine. This makes me think it's either something unique to my computer (e.g. software installed on it), or something in the router that is able to uniquely identify my computer (e.g. by IP address).
I've checked inside my computer case and there doesn't appear to be any hardware I don't recognise, so this issue is likely achieved through software somewhere.
Using different browsers doesn't work, so it's probably not a browser add-on.
That's all I can think of for now. If you have a suggestion for some diagnostics to run I'll update this list with the results.
edit I changed my computer's MAC address and it instantly connected to the internet just fine. What does this tell me about where the issue lies and how I can remove the underlying cause?