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The solution was simple. We have an UDOO x86 Ultra on the robot where hector_slam is running and a control computer (Intel NUC) where the roscore and several other nodes are running. It seems the WiFi was too slow for the higher fps laser data (even with reduced points/fps/fov). We changed our access point from TP-Link Archer C5 to an Ubiquiti and now it's working great.

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