OK, this night it showed ER18 communication problem with the print head after stopping...
This would have put the log files onto the USB drive.
Please send the log files to us, using WeTransfer, so we can analyze.
But mostly, this is caused by some problem with the cable getting loose in the printhead.
See http://ultimaker.com/ER18 for information and on the forum https://ultimaker.com/en/community/42426-print-head-error-communication
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Marco_TvM 34
It might help us if you can get us the logs of the printer using WeTransfer or something similar.
You can get the log files using the menu: System -> Maintenance -> Diagnostics -> Dump logs to USB.
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