Need help resolving problem with random application startup on my Motorola Defy+.

I bought a new Motorola Defy+ yesterday and now after running it a little over 24 hours I am facing problems with it. As soon as I enter "Dialer" to call contacts, random applications initiate.
These application run in background and drains the battery pretty fast. Is this problem common or is it just happening with my phone? Does this have anything to do with buggy User Interface? Can someone suggest a solution?
