Downloading causes router to reboot

I've run into a recent problem. Whenever my computer downloads anything, such as Steam update or Windows update, it causes the router to drop connection almost immediately and reboot.

Anyone have any idea what the issue might be? This is greatly annoying. The computer is connecting wirelessly if that has any bearing. The router is a Linksys EA 6300.

The computer is custom built:

OS: Windows 7 Pro (64-bit)
CPU: Intel Core i5-760
RAM: 8 GB DDR3 G.Skill
Sound: Creative Titanium X-Fi
Video: Nvidia GeForce GTX 580
HDD: Seagate 500 GB (OS)
4 Storage Drives

 

Yes, it is the router rebooting. If I walk over to the router, the lights flash, the same as if I had done a hard reboot (i.e. unplug/replug the router).

Surfing the internet causes no issues.

Other computers on the network seem to work fine when downloading via Steam or Windows update.

I haven't tested hard wiring to the modem because the computer is in a different room than both the router and modem and it's a desktop, so not easily moveable. It does raise another consideration. Originally, this computer was connected to the router via a powerline (effectively hard wired). However, for some bizarre reason, it was slowing the network considerably and at one point, it prevented the router from working at all.

 

To be sure, it is the router rebooting and not your connected computer, right? What if you connect via Ethernet? What if you bypass your router and connect your computer directly via Ethernet to the modem?

What if you are just surfing the Internet (which involves lots of downloading too)?

What if other computers on your network attempt to download something?

I am not crazy about power line networks - there are too many variables that can affect network performance.

It is still odd that only your computer does this and that it happens via a wireless connection so it is not like there is a short on the network cable.

You might look at your router's admin menu for "connected devices" and make sure you know what each is, and that it is supposed to be there.

If me, I would make sure my system was free of malware. I would also reset your entire network (since this is what your ISP will have you do anyway). You do this by shutting down all your connected devices (computers, networked printers, game stations, Blu-Ray players, Internet connected TVs, etc.) and unplugging them from the wall (to remove any "stand-by" voltages that may maintain network settings. Then unplug power to your router, then the modem. Wait about 60 seconds and plug in the modem. Wait for lights to settle down, then plug in router. Again wait for lights to settle down then plug in your computer and see if the problem returns. If still a problem, you know it is not caused by any other connected devices.

If no problem, you might one-at-a-time add your other devices back on your network.