sansa clip bug radio volume

I have Sansa Clip 2.0GB version:  2.01.35

and i have bug  on the radio volume.

when I’m turn down the volume to 0 and change stations on the radio  the volume back without i even touch the volume button.
and when i’m try again to turn down the volume it’s show me the volume still on 0 and it’s not true because i can still hear the radio.

not big bug but still a bug…