After some researching of the problem I could not find an solution for myself but did find some diagnostic steps I will present now:
This is the version of the kernel I am using. I have been using it since Nov 15th (I think, but for a couple of weeks at least) with no bluetooth issue until today.
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$ uname -a
Linux jaari 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
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$ lsmod | grep bluetooth; dmesg | egrep -i 'blue|firm'
[ 0.043524] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 0.244448] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 2.116716] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_01.bin (v1.1)
[ 5.381824] ath10k_pci 0000:3b:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:3b:00.0.bin failed with error -2
[ 5.381831] ath10k_pci 0000:3b:00.0: Direct firmware load for ath10k/cal-pci-0000:3b:00.0.bin failed with error -2
[ 5.384210] ath10k_pci 0000:3b:00.0: firmware ver WLAN.RM.4.4.1-00079-QCARMSWPZ-1 api 6 features wowlan,ignore-otp crc32 fd869beb