I have a gaming PC with two Network cards in PCI slots and a LAN port on the motherboard. I few months ago the first card would stop working after waking up my PC. I would have to disable and enable the card to get it to work. I got a new NIC, and it solved the problem for about a month until the same problem started happening again. It would show the networks and be able to connect to them (taking its time do so) but then would just say connected no internet. I decided to go wired and it worked great. After a week it stopped. Same thing except I couldn't disable and enable the port to get it to work again. 

Is my motherboard failing? I am running out of ideas, and have updated the drivers for the NICs but the next thing I will do is try to update my motherboard firmware. Any help or suggestions are appreciated, thanks.