Originally Posted by petemagsig

I've been using my kindle and my iPhone together for more than a year now and only recently have I been having sync problems. I never had to go back to home in the past, and even when I do that now it is not guaranteed to sync. Introducing a manual step in the syncing process beyond simply shutting off the kindle or exiting the iPhone app would be an extraordinarily bad design decision, so I can only assume that this is a bug in the kindle whispersync software on one or more of these devices. I am going to be contacting Amazon about this problem.

In other words, I wouldn't assume you're "doing something wrong", I'd assume the software isn't working appropriately.