communication problem

[berberic2]

I’m getting sporadic communication faults if the printer is run by octoprint:
Problems are always in the form of (excertp from octoprints serial.log):

Send: N23153 G1 X0 Y0 Z50*80
Recv: o3 N23153 P63 B7
Recv:  T:23.98 /0 (15658) B:25.09 /0 (15629) @:0 B@:0
Recv:  T:21.45 /0 (15723) B:22.58 /0 (15694) @:0 B@:0
Communication timeout while printing, trying to trigger response from printer. Configure long running commands or increase communication timeout if that happens regularly on specific commands or long moves.

where in the ok of the printers reply one of the characters is wrong. During my test I got:
k 1k 2k 3k 4k 7k o0 o1 o2 o3 o6 o7 o8 o9 instead of ok.

Two times I had Communication timeouts after a correct ok

As far as I could test it is independent of the cabeling and the host-computer.
The fact that only ok is affected speaks against a general communications or USB problem.