I use the Epson WF-2650 and had similar issues to those described above. I was trying to scan a few documents using xsane and when it would scan the file the file would disappear. I looked around for other programs but everything I tried did the same thing. I updated the Epson drivers to the newest ones and still no luck. Finally out of frustration and lack of ideas I plugged the printer into the USB cable. Scanning worked wonderfully and I was able to complete my project. This solution sort of defeats the idea of having a wi-fi printer but I hoped it would only be a temporary driver issue.