I think its becuz of wobbling motor assembly, possibly due to wear and tear, when the cost of a device containing moving parts drops below 1000/-, the quality is bound to suffer. Even servicing such devices will not be cost effective. So, either u have to stand such noise, or try a little lubricating oil (used in mechanical watches, not for cars, try not to disturb the laser assembly, and prey), or get a new one (which is easier if u hve spear money).
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