Computer And All Connected LAN Devices Freeze Simultaneously

It started happening back in around November, my sister and my computer would start freezing occasionally, slurring the audio into a robotic sound, eventually to come to.It gradually got worse, and I assumed it was a graphics card problem since it would freeze ONLY SOMETIMES and say that the graphics driver stopped working and has recovered. It usually didn't say that, though.Lately though, I noticed that when it would freeze sometimes the internet would go out for some connected devices, such as the Xbox 360. The only computer that was NEVER affected by this is the one connected directly by Ethernet to the Netgear router, (every other device is WiFi.)

Sometimes even, my sister and mine would freeze simultaneously. It was a sort of rare occurrence, though.I very lately started to notice that it would freeze when trying to load internet components with larger amounts of data, such as server console logs, Flash videos, and Soundcloud players. What threw me off is that it would sometimes freeze in programs like FL Studio or Windows Media Player... It's possible I guess that the programs were unrelated and what caused the freeze is SOMETHING sending/receiving corrupt packets.