OK, the phones are out of warranty, so I say, "Let's open it up." A few teardown vids on YouTube later, and I have her unit all apart on the workbench (after moving the ailing A31p out of the way). The way it senses that the keyboard is out is a tiny permanent magnet in one of the plastic panels. The motherboard has a sensor. When the two move apart, it's supposed to switch over. There's nothing else obviously wrong with the phone, so I reassemble it. Doggone if it isn't still doing the same thing where it won't switch after sliding out the keyboard. That is, until I discovered the secret handshake. If I open it slowly about 1/4 inch, then it switches every time, and I can open it the rest of the way and it's in the correct mode. Appears to work every time.
So, the bottom line is, "You're holding it wrong."




