Volume problem with Bose S1 pro

Bose product name

Bose S1 Pro

Country

Bolivia

Firmware Version

(7.1)

What devices were you using that were affected and what version are they on

Bluetooth connections

starting at that point of the volume the sound suddenly starts very loud

Detailed description of the issue and steps to reproduce

The issue is that I cannot increase the volume from 0 to the first level...basically there is no sound until the first level of the volume level, as it shown in the figure, then when I pass that level suddenly the sound comes very loud, so I decrease it and goes to 0 volume, so there is no mid point, it goes from 0 to loud suddenly. 

Anyone with this similar situations?.....I use a Bluetooth from my iphone to reproduce music.

 

Where do you run into the issue?

I just noticed couple of weeks ago

When did you start to experience the issue? Did it work correctly previously?

couple of weeks ago.

Any troubleshooting steps you took

Reset the speaker but then no idea on what else to do.