When I first got my phone, if searching SMS for a common word or phrase that I know I had used multiple times, it'd bring it up in the search with "15 results" "5 results" etc. However now when I am searching for very simple phrases or words, or even long ones that I KNOW I've used, it's only showing VERY RECENT results. It doesn't seem to be searching far back anymore? Is there a way to fix this? What's causing it?