I?ve ridden my bike less than 10 times. First time the chain came off and got stuck in the sprocket. Had to take it to a shop to get it fixed. Then my bike started making a loud squealing noise that was coming from the brakes. The only way to get it to stop making the noise was to actually gently push on the front brake. Again I took my bike to a shop and they got it to stop making the noise when I?m riding it. Now it makes the loud squealing noise when I use the brakes. And now after I?ve ridden my bike for a little over 5 miles, my throttle and pas stop working. I have to turn the bike off and pedal like a regular bike. The battery is fully charged. I?m 67 years old and that thing isn?t easy to pedal up hills. If I turn the bike back on, it will work for a little bit and then again I lose all power. I have tried to contact rad power bikes, but I can?t get anybody to talk to. Waited on the phone for over three hours for somebody to pick up. Of course then I read all the reviews about the lousy customer service that rad bikes have and afraid I wasted my money buying this thing. The bike is still under warranty but I can?t get anyone to help me. Anyone else have this problem? Help!