After being powered down for some time, the robot has changed position, is this normal?


Yes this is normal. The brakes on joints 1,2 and 3 are designed to prevent the robot from abruptly falling during shutdown. They have a friction-less design so as to not damage the motors. 

In some positions the robot is more susceptible to sagging over time if it is shut down for a prolonged period. For instance, in a more extended position it will be more likely to sag down than in the zero joint position. It is best to find a more solid position if you know the robot will be without power for a significant amount of time.

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