Same issue here running 11.04.
Bus 002 Device 010: ID 148f:2570 Ralink Technology, Corp. RT2570 Wireless Adapter
[23265.079987] phy2 -> rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x04d4 with error -71. [23265.080095] phy2 -> rt2500usb_regbusy_read: Error - Indirect register access failed: offset=0x000004d4, value=0x0000ffff
Same issue here running 11.04.
Bus 002 Device 010: ID 148f:2570 Ralink Technology, Corp. RT2570 Wireless Adapter
[23265.079987] phy2 -> rt2x00usb_ vendor_ request: Error - Vendor Request 0x07 failed for offset 0x04d4 with error -71. regbusy_ read: Error - Indirect register access failed: offset=0x000004d4, value=0x0000ffff
[23265.080095] phy2 -> rt2500usb_