If your new bike is making an odd sound like a sort of squeaking noise, or rubbing sound, that comes and goes, check the relative positions of the footpeg and rear brake pedal.
It's all too easy to rest your foot on the rear brake pedal and ride the brake so much that the pads wear down to the metal. It may be intermittent because it depends when you use the brake.
If it is a grinding sound you need to get some new pads in pronto as the hard metal backing plate of the pads is grinding your disc down.
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