There was a lot in regards to this after the KitKat upgrade. It's not just one carrier too, it seems to be happening sporadically across the board, across carriers, to random people. I'm also one of them. Strangely, I was running a Kit Kat ROM for a while, then bam one day it started.
Some people have done a full factory reset and have found that fixed it, others it doesn't seem to matter.
I haven't heard anything lately on it though, but it is definitely annoying. Until then, it's the Airplane mode toggle solution for me.Which is about 8 times a day...