I've been noticing that my phone's been getting considerably more flaky on wake-from-sleep. This is particularly noticable if it's just fetched email. Bong, it goes, to get my attention, then refuses to respond when I try to turn it on (a black screen is all I get). Waiting a while, and the faffing with the mute switch seemed to be the best solution.
I was planning to post a whinge about all this, but this morning iTunes announced a software update that covers this exact problem (plus a couple of others I'd noticed). So a caution yay on that front.
'Course, the bastard thing still holds onto the POP connection, so I can't get at the mailbox via the desktop until that times out, but never mind.