Recently upgraded from USB 760 to MiFi 2200 and am having strange problem connecting my latest generation Kindle. Previosly I connected to a Cradlepoint router and via USB 760 to Kindle Store. Using WEP 128 bit same as before, Kindle won't connect to MiFi. Connects fine in temporary hotspot mode but rejects password for WEP connection. I know the password entered is correct because it works for my printer and blueray player. Ideas?