I've noticed that my bike likes to vibrate an insane amount, but only sometimes. There will be times when it is perfectly fine and enjoyable, and other times when there is a high frequency vibration throughout the bike. It is so bad that after about 10 to 20 minutes, I want to stop riding. I can feel it in the handlebars, footpegs, and anywhere else I touch with my hand. But again, it's not all the times.

Any idea how to figure out the cause? And possibly stop it?