I used to see this often when I used to do USB printing (I don't any more so it might be that) and also I upgraded my firmware last January and haven't seen it since (also did more upgrades this past spring). The version of marlin you get from here is much much newer than that which comes with cura. And it has some very nice and minor feature improvements - try it and if you don't like it you can just reinstall the version that comes with cura:
http://marlinbuilder.robotfuzz.com/
So I'm thinking it is a bug related to USB printing or maybe a bug that was fixed in Marlin.
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foehnsturm 969
Same with mine and with the SD card reader as well. But no real idea why, a loose contact or a less then optimum solder joint somewhere?
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