ITunes intermittently not recognizing iPhone until reboot

There seems to be an issue with iTunes recognizing my iPhone, but only after it has been connected and disconnected several times. The only way to clear the issue is to reboot the PC. Interestingly, the PC seems to see the iPhone, at least it makes the new hardware audible alert and the Apple Mobile Device USB Driver appears in the Device Manager list. Also, the iPhone charges while attached. Only iTunes doesn't register the iPhone and doesn't sync. Killing iTunes doesn't help. Unplugging and reinserting the usb connection doesn't help. I have to reboot the PC to get iTunes to see it again. Boy, this is annoying.
Dell   Windows Vista   Intel 82801G USB2 Enhanced Host Controller

Ever since I began running into this issue (often), I have been using the eject button in iTunes prior to removing the iPhone connection -though I must admit I wasn't doing that at first.
My system is configured for automatic updates. But just to be sure, I manually ran Windows Updates and confirmed that all is up-to-date. I searched around for any driver updates to my USB Host Connector, and that is running the latest drivers.
I understand this is probably not the most pressing issue to face the iPhone team. It is, nonetheless, a pain in the royal arse to have to reboot just to sync, especially when I am rushing to head out the door and want my calendar sync'd. Frankly, I have never quite been as happy with iTunes the windows software, as I have been with the iPod itself - and now the iPhone. That being said, there is a lot of crappy windows software out there. Right now, though, it is only iTunes making me reboot everyday (well, now I just have kill and restart a bunch of stuff - something of a relief)!

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