Bluetooth speaker sound distorted (ubuntu 18.04)

[thomas72]

In a new laptop, the sound from my usual bt speaker (JBL Flip 3) is distorted: it can be ok for a few seconds but mainly it's crackling and interrupted intermittently.
Also the connection process is sometimes tricky... I have to connect/disconnect several times. The same speaker is working fine on another Ubuntu 16.04 laptop.

What I tried so far:

• If I boot with Windows, it is ok
• Within Ubuntu, another bt headset works fine
• The good old trick of switching profile (A2DP/HFP) and then disconnect/reconnect doesn't solve
• I've reinstalled pulseaudio and pulseaudio-module-bluetooth with no luck

Furthermore, my dmesg is full of:

Bluetooth: hci0: last event is not cmd complete (0x0f)

Apparently others are experiencing the same issues: Ubuntu 18.04 and bluetooth speaker JBL Charge 3

[medina12345678910]

Try disconnecting it from the bluetooth and reconnecting it again.

[thomas72]

Try disconnecting it from the bluetooth and reconnecting it again.

Well... obviously I've already tried that before posting on the forum, check #3.
I've also updated bluez to v5.50 with no luck