Apple Working on a Fix for the iMessage Trap
As we reported previously, users who switch away from the iPhone are having trouble with their phone numbers remaining tied to iMessage, causing them to miss SMS text messages from other iPhone users. Apple told Re/code that it has fixed a server-side bug that was partially responsible for the issue and that it is working on a software update to address the issue more fully.
It seems their attempted fix has caused my wife's iPhone to stop receiving any iMessages from me. She still gets them on her iPad.
Yes, coincidence most likely, but this is a new issue for us just the last couple of days.