So noticed something weird with KitKat, and confirmed this on two different phones (Nexus 5 and Moto G but running latest KitKat 4.4.2). On occasion (not every time) the phone seems to auto dial someone after you've ended a call with someone else.
My wife reported the problem first with her Moto G. At first I thought she might just be accidentally hitting a button after calling someone (this is her first smart phone and first touch screen phone) but it's happened several times for her. Final catch was today when I clearly had it happen to me (it also appears it may have happened before once or twice on my phone). I had called someone using my bluetooth in my car, at the end of the call I pushed the hangup button on the steering wheel, and the call ended. Then my wife picked up the phone to call another person and we both noticed it was calling some other friend of ours (that I had txt'd with maybe 2 hours before). It had just started calling this person for no reason. We quickly ended the call (hopefully it didn't bug them), but wow is that annoying.
Has anyone else seen this? It seems to happen every once in a while right after hanging up with another call. It seems to call someone in either your recent call or txt history. I'm not sure what might trigger it as it doesn't happen every time, and I'm not sure what number it chooses to call (though it does appear to be someone you recently called or txt'd).
If I hadn't seen it do it right in front of my face with no contact with the phone (bluetooth handsfree only) I wouldn't have believed it.
Again, both KitKat based phones but very different manufactures.