If you're using 16.04 then there have been no high-level bluetooth-related updates at all recently:
bluez 5.37-0ubuntu5 ... 2016-03-09 pulseaudio 1:8.0-0ubuntu3.3 ... 2017-06-30
So if your system was working for the previous month or more then the problem is not caused by bluez or pulseaudio at least.
You might want to assign it to "linux (Ubuntu)" in case it was caused by a recent kernel update like:
linux 4.4.0-91.114 ... 2017-08-07
which sounds more likely by the date.
If you're using 16.04 then there have been no high-level bluetooth-related updates at all recently:
bluez 5.37-0ubuntu5 ... 2016-03-09
pulseaudio 1:8.0-0ubuntu3.3 ... 2017-06-30
So if your system was working for the previous month or more then the problem is not caused by bluez or pulseaudio at least.
You might want to assign it to "linux (Ubuntu)" in case it was caused by a recent kernel update like:
linux 4.4.0-91.114 ... 2017-08-07
which sounds more likely by the date.