Thanks, TimoHere are a few responses:Some questions:- Which version of Actisense Reader you run the tests? I'm using 22.214.171.124. I did see the same situation when feeding the data from the Arduino directly to my Raspberry Pi into OpenPlotter / Signal K server.- Did you close and restart NMEA Reader between each test? Yes- Do you have other system like Teensy for making same test? No, I think that's my next step to make a Teensy device. Need to order many parts for that.- Can you make same test by feeding Due bus with other device and with NMEA Simulator? As aboveAny other thoughts? Thanks!