Not wishing to offend or upset.. just a thought.... "Parental Controls"???? Your not playing your game until your room is tidy, homework is done... eaten your vegetables sorts of things.. .. ..
If that was the case, it could be 'anything' ... it would have to be looked at on a much more personal depth and level...
I have friends that use these sorts of tactics on their kids.
I'm 21 and this is my personal pc... I dont go to bed at 8 of course but the first time it opened was at about 7pm and last time was at 1am (just before i went to bed)
That is still no excuse to not keep your room tidy or to not eat your vegetables...
Which part of the world are you in .. 'ball park'?... as certain ISP's have certain practices in different parts of the world that others wouldn't consider.
As I would look at ruling out ISP throttling or blocking .. a DNS issue so to speak.... ie: if you had a laptop and it worked at a mates or the library and not at your house.. then it would be the physical location and the equipment used at that location that you would look into.
Is the Network settings for your PC switched from Private/Known network to a Public one.. where it just closes the door on the software?
