A recent Apple support note tells a tale: depending upon the particular USB setup, the placement of USB hubs, and how the keyboard and mouse are connected to the system, users may experience â€œunexpected behaviorsâ€ and â€œgeneral system instability.â€
Some third-party USB hubs and devices connected though them may disconnect unexpectedly after the computer is woken from sleep. This may cause unexpected behaviors such as general system instability within open applications, or data loss if a connected device was being used to store data from an open document. If a printer was connected through the third-party USB hub, it may not be recognized.
There are a number of variables in the issue that described in the note. And Apple says it canâ€™t provide a list of the problem hubs.
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