Over the last week I occasionly get a usb device not working error message, even when there is nothing plugged into a usb port.
Everything is always working ok though, but a little while later 10-15mins the touchpad or if I have a mouse plugged in stop working, the cursor disappears & doesn't return.This happens without any error message.
I have to use the power button to turn off do a restart & then everything is fine again.
Another problem I have is if I want to download anything a photo a file etc then I get the file or photo showing to download, but then brings up a zero kb file size & failed download.
Does not matter which browser I use. If I right click on a photo or file in gmail it then downloads it without any problem.

Any help appreciated.