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hunt Down comunication errors on Ramps 1.4"ish" (4 replies)

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hey everyone,
I got some wired Issues like.. for 5month now and i dont find it.
setup: Arduino Mega / modified Ramps Marlin 1.8 // 2.0-dev
I can print.. 5-20miuts than i get com-errors and the serial comunication brakes.
I tried Octoprint(not Octopi) and Pronterface same problem so no host problem
I tried Marlin 1.8 1.8 with advanced OK and Marlin 2.0-dev so maybe no firmware Problem
I tried a diffrent Arduino board.
I tried 3diferrent USB cables, and finaly even wrapped Aluminium foil around them. no change
i do run only 112500 baudrate...

I dont have a clue on how to proceed.

** any hints ar wellcome but dont tell me to switch the powersuply of my pi ;-)

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