Seeing very similar symptoms on Ubuntu 17.10 running 4.13.0-19-generic or 
4.14.0-041400-generic.
Sometimes, but not every time, BT is not available after resuming from suspend.

>From other data sources, the root cause is a lack of .reset_resume
handler in the BT driver.

A possible interim fix (worked for me) is

sudo modprobe -r btusb
sudo modprobe btusb

This at least gets BT up again.


A possible (but not confirmed) temporary reboot-persistent fix is

sudo vi /etc/modprobe.d/btusb.conf

and add line with:
"options btusb reset=1"

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https://bugs.launchpad.net/bugs/1561474

Title:
  Bluetooth will be disable after resume from suspend on Xenial

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