I have just installed Arch Linux with kernel version 3.9.5-1. While running xorg (in particular, XMonad), my Microsoft optical USB mouse fails (stops sending movements) after a length of time, every time I run my computer. When I look at the underside, the light is still on, but it is significantly dimmer. The problem is not solved by restarting xorg, but rebooting the computer temporarily fixes the problem.
Only a couple of days ago, I had been running both Windows 7 and a previous version of Arch with no problems regarding the mouse at all, so I think that the mouse itself is still fully working. Does anyone have any suggestions as to how I can solve this?