There are a couple of reports of this, and I've been experiencing the bug as well.
E.g.
(with the most info on the bug)
but also
etc.
I am happy to help with any testing. Currently running kernel
4.4.0-999-generic #201512172100 SMP Fri Dec 18 02:02:38 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Best,
Jonathan
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