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I have come across the same issue. For me, the problem was due to the use of software serial library. I changed my Uno for a Mega and used one of the hardware serial channels.

After that, we have seen the problem surface arise here and there. Normally, simply reuploading the code solved our issue. If not, we removed the build and devel folders, did a full catkin_make, rebuild the arduino scripts and re-uploaded the arduino files.