For my TSU9400 I have setup a second, dedicated wap (router) that acts as a switch in my network. DHCP switched off, Pronto has fixed IP. Pronto network timeout is 24 hrs. WPA2 security and restricted access by MAC adress.
It all looks good. The TSU9400 makes fast and easy connection. When the screen dims and I pick up the Pronto, network re-connect is immediate.
But... when I leave the Pronto alone for a few hours, then re-connect does not work. The connection goes on / off / on / off / ... every few seconds.
Resetting the router, then everything works okay again.

What is going wrong?

I read this on the Pronto FAQ: "Note that the Pronto will only connect to a new WAP if it looses the WiFi connection." What does this mean? Is this related to my problem?