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I have a bicycle fitted with Shimano Nexus Di2 automatic hub transmission system. All was functioning quite satisfactroily till recently. However since one week the automatic gear shifting stops at the 4th gear, the gears won't shift beyond the fourth level even when the speed exceeds 15 kmph. In effect the pedals become quite light to operate-dangerously and hazardously so. In fact my feet slipped off the pedals thrice because of this abnormal lightness. Typically when I start pedaling the gears do shift intially, each shift marked by a healthy beep, till the fourth gear engages. At this point there is a long beep after which the gears won't shift any further. The automatic headlight turn on function in response to the ambient light is unaffceted and is quite seamless. Please suggest a solution. I am awaiitng reply at gharshe@gmail.com

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