I agree with that logic, Jerry, particularly that the radio itself cannot cause reboots. But there seems to be growing evidence that the combination of IHO and a (properly) updated radio IS causing reboots. And it's not arbitrary reboots using any kind of apps, it's on sending/receiving SMS and on airplane mode cycling. Possibly other actions too that use the cell radio.
I started as a programmer 32 years ago, I know where to look if things get wonky. You've not seen me complain about instability ever, since I first came to IHO in Sep/Oct. But this one has a different feel to it.
So far I'm thinking PRL is not affecting this - which I did suspect for a moment. I'll be doing more studies, including a complete reflash and rebuild (as I see some have already done). But not until Mon pm. Today is wife day!