Printing hiccups with  and even with ,

3D Printing
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1

Printing hiccups with #Octoprint and even with #Pronterface , in the #Cura printlog are many of these lines:

Error:No Line Number with checksum, Last Line: 119348
6k
echo:Unknown command: “74”
rror:Line Number is not Last Line Number+1, Last Line: 125235
9k

Does this sounds familiar to someone? How can it be solved?
With Pronterface and Octoprint the action stalls for several seconds or in the worst case don’t continue anymore. Only Cura does print without hesitations.
My setup is a #Melzi board on #Marlin with a glcd.

2

That looks like serial communication issues - use a shorter or better shielded USB cable and check your power supplies.