Constant vibration iPhone 3GS

Hey guys. My iPhone is vibrating almost non-stop. It goes in periods of about a week or two. I mean, for one week, it will might only vibrate when it's being used. Other weeks, it will vibrate all the time. There are also these "moments". I call them moments of clarity, where the iPhone acts normal for about an hour.

I've had two of these moments so far in about 5 months of vibration. It's pretty spectacular, you guys oughta be grateful.

Anyway, my question really is, do you think the problem is with the vibrating motor or more likely the circuits outside of the motor. More specifically, I'm thinking of purchasing a vibrating motor (link under this paragraph), and I'm not sure if that's going to fix the problem. So, I'm asking you guys, as professional smart people, do you the problem is with the vibrating module?

Vibrating motor:

iPhone 3G and 3GS Vibrator

More info:

• I can feel the iPhone vibrate HARDER when it's supposed to be vibrating. IE, if I have it on, and it's doing it's vibrating thing, when I get a text it'll go something like: zzzzzZZZZzzzzz. As if like it gets an extra push of vibration. This leads me to believe there's some extra current that's being constantly supplied to the motor in addition to the regular current. A short circuit? Where? Questions...
• When I turn off my phone (standby), there's about another 20 seconds of vibrating before it stops.
• It will occasionally (not sure about the frequency, probably about once every 3-10 minutes), vibrate for anywhere from maybe 20 seconds to a minute (I'm guessing the phone wakes up for a bit to check stuff)

So, please, help me iFixit smart person, you're my only hope!