Internet dropping for one device

That's the thing, I didn't do anything to the computer (yes, it's a full tower desktop).  I usually just turn on the computer and watch some shows before I go to bed.  But as in my other reply, it seems one of the satellites was acting weird.  IDK, every other device was ok, except that computer.  Windows diagnostic kept saying it had to fix the gateway.  When I check the properties, it shows the correct gateway.  It was connected to the network, just didn't have Internet.  I even configured the computer manually (changed the IP and specified the gateway).  What got me was that it worked flawlessly when I connected it to my phone.  So it was not my computer hardware or software or its settings.