I started having this issue as soon as I loaded the new vector based Google Maps app, a month or so ago. Soon after they released a new version which I installed, and that seemed to take care of the problem. I have one reoccurance since then and I killed a couple of running apps and it hasn't happened since. I have a feeling that there is some type of bug in android because it is supposed to swap the programs in and out to prevent this. I never had the problem at all until Google Maps changed. What really ticks me off is these stupid apps that you can't remove,because they start up again automatically, like SKYPE, CITY ID, and some others. That's what I am doing in this forum, checking out to see what is involved with rooting so that I can remove this junk.