Upgrading bluez to 5.50 as mentioned in link below fixed the problem with bluetooth headphones not connecting after resume on Ubuntu 18.04.
https://askubuntu.com/questions/1036195/bluetooth-doesnt-work-after-resuming-from-sleep-ubuntu-18-04-lts
Upgrading bluez to 5.50 as mentioned in link below fixed the problem with bluetooth headphones not connecting after resume on Ubuntu 18.04.
https:/ /askubuntu. com/questions/ 1036195/ bluetooth- doesnt- work-after- resuming- from-sleep- ubuntu- 18-04-lts