Apps become un-launchable, require re-authentication

I've been having a problem with third-party apps suddenly becoming "un-launchable" - I'll touch the icon and the window will start as normal, but then abort - no error message, just a return to the home screen. When this happens, it usually happens to all my third-party apps, but sometimes it's only a subset.
The usual tricks don't work - I've tried restarting the phone, re-syncing it, checking for updates for the apps in question, and so forth.
The only solution is to download another app. The process of re-authenticating (entering my App Store password) and then fully downloading the new app solves the problem: All of the un-launchable apps start behaving normally again.
This seems to only happen if my phone has had a full battery discharge - i.e., down to the level where all I get is the battery icon when I attempt to use the phone. The phone recharges normally, but if I want to use a third-party app, I have to go through the process of downloading a new one.
What's going on here? This can't be a design feature of the iPhone OS. How can I avoid this in the future?

I've had this problem for quite a while. Before I realised that 'all I had to do' was download another app, even one I already had on the iPhone, I was plugging my iPhone into the laptop to re-authorise it.
Massive PITA, especially as this happened a number of times when travelling.
The device was rendered useless - great phone/pda, have to carry a laptop around with me to make the phone work every now and then.
Rogers (the Canadian carrier) told me about the download fix, but were unable to pinpoint a cause of the problem, but did mention that it was a common occurance recently. The CSR wouldn't say it it was related to a particular OS, but I've been having this problem since 3.1X.
I hope Apple can fix this soon. I'm not very happy with the stability of the phone these days.
coop

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