Comment # 1 on bug 959230 from Takashi Iwai

(In reply to Toomas Aas from comment #0)
> kernel: ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request
> 0x07 failed for offset 0x7010 with error -110
> kernel: ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request
> 0x06 failed for offset 0x7010 with error -110
> kernel: ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request
> 0x06 failed for offset 0x0404 with error -110

The error itself looks common with this chip, hitting many reports on Web.

> After rebooting, I can again use the network for some time, but soon the
> problem reappears.
> 
> Interesting thing is that this only happens if the system has 10 GB RAM. My
> system has 2x1GB plus 2x4GB DIMMs, and when I remove one of the 4 GB DIMMs
> (thus reducing the amount of memory to 6 GB) the problem does not appear. To
> rule out the possibility of bad DIMM I have run memtest86 for several hours
> without finding any problems, also the system is rock solid with 10 GB RAM
> when I remove the USB wireless adapter and use wired Ethernet.

So this implies that the host side influences on the problem.
Oliver, any clue?  Some DMA issue?