Maybe it's just my own quirk, but I hate the feeling of being "ambushed."
Maybe a TM with a "Today's been nuts, but I wanted to let you know that I've gotten all of your messages. Is everything okay? What is it you need to discuss?"
Indeed, this is something I've been working on in my conversations with my wife: I don't let her get away with saying "never mind" when she starts to say something any more, and if she calls me on doing the same, I come clean.
PDT has it right: you're a busy guy, so if she "needs" you to call her, she should be able to give you an idea of what it is about.
Me: 44, Wife: 39 M: 17 years T: 20 years Bomb on 08/25/09 1/13/10: MC started 1/28/10, 2/8/10: More bombs 8/28/10: Wife moved out No talk of D, no movement