I concur, it does appear to be a problem in VirtualBox only. The adapter is being kept by the VirtualBox Manager process, which, if you leave running for long enough, will crash and reset. Thank you for looking at this.
I do have another potential issue for you. This one is to do with uploading an image. I have created a new Image on the server, given it a name and OS type (Linux). I then created a task for my Host so that an Image would be taken from the Host (a Debian VM) and uploaded to the server. On PXE boot the task begins, an image is taken, but it is never uploaded to the server (I get the attached error on the host).
[ATTACH=full]644[/ATTACH][ATTACH=full]645[/ATTACH][ATTACH]644[/ATTACH][ATTACH]645[/ATTACH]
[url=“/_imported_xf_attachments/0/644_Error.png?:”]Error.png[/url][url=“/_imported_xf_attachments/0/645_Error.png?:”]Error.png[/url]