Assuming you have wifi router for PC intrnt access, connect your phone to it, disable mobile data. Check if you can play a youtube video or download image or something. If you can, it will narrow down to PC.

Try to flush DNS. (google it. depending on system. It is fairly simple task) It might resolve the issue. Since it is most likely your hardware/software situation, I doubt NI will be much of help.

P.S. I had similar instances where rebooting did not help.... But shutting everything off completely (modem / router / computer) and turning back on brought it back to life.