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I would like to suggest a few measures which you should try out once:

  1. One of the possible problems could be stalling of CPU cycles, Firstly, check the CPU processing of your laptop while gmapping package is running on turtlebot and simultaneously observe the turtlebot movement in rviz. If you observe CPU cycle striking near 100% or if rviz hangs or goes offline for short time interval every time the turtlebot moves, then one of possible solution is to increase the parameter value of "map_update_interval" in gmapping package to around 25-30.

  2. If still the problem exists, the other solution is increase the the parameter value "maxUrange" in gmapping package according to the environment. According to my experience if your room is about 10m by 5m , then your range shoud lie around 5m atleast.

This worked out for me.