Maybe this is related to kernel bug 197147. If you are running kernel 4.14 you are almost guaranteed to have hit it.
The intel team has confirmed there is a problem in the BT firlwamre and have published updated firmware that fixes the problem (at least for me). So basically, upstream has fixed the issue. In the discussion ( https:// bugzilla.kernel.org/show_bug.cgi?id=197147 ) theree is a .tar.gz with thd new firmware files that should be copied to /lib/firmware/intel Give it a try, and if it fixes it, the package mantainer should consider, please, updating to the latests firmware
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