Sharp Hiptop 3 / Sidekick 3

When I called T-Mobile to activate my Sidekick the lady told me that I should turn off the device for at least 10 seconds (but no longer or else it loses data) every day to keep it running properly. I think that is ridiculous! Are we living in the 19th century? These things should be able to "hold information" without having to turn them on and off constantly. I forgot to turn it off for a few days and when I finally did, a whole bunch of text messages came through. So I guess you really do have to turn it off and on to make sure you're receiving things? Is anyone else having to do this?