I think if it is to have a future then the infamous Uno 'avrdude: stk500_recv(): ' errors need to be addressed. How many new users encounter this issue and don't get a resolution I wonder? And that is probably the last time they spend money on this platform, maybe this hobby.
I've just had a quick look at the schematics and it looks like you can use software to turn the shield on and off. If this is the case then periodically send an AT to the shield and if it doesn't respond within a certain time turn the shield off and back on again.
But you can't search for three exclamation marks, it returns no results. And given how often that crops up it would be handy if it did. Or if there was a sticky explaining the problem in the appropriate section?