My phone does things like that sometimes. I have a D1 and the other day, every time I hit the "g" button on my physical keyboard my gmail would open. It started out of nowhere. I am rooted, so I went into recovery, wiped cache and dalvik cache, rebooted, and its been fine since.
I couldn't tell you why these things happen, lol. I don't know what kind of developer support your phone has, but I can say, rooting is the best thing I have done for my phone! I would look around and see how many roms and kernels are available for your phone. Even if there's not a lot, you'll stil be able to perform some maintanence on your phone yourself, plus many other features.
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