KORG PA4x volume change

[Kendos]

Hello,

A few months ago I purchased a KORG PA4X . the operating system is similar to the keyboard I had before the PA600
but I have a problem with this new keyboard I hope someone can help with.
If I start to play a style or play along with an MP3/song, the overall volume increases. When the style/song ends the volume
drops back again to about half. would be grateful for some help with this.

 

[Biggles]

Check that you have the latest OS which is OS Next.

Does the volume change with all styles or just certain ones?

Also does the volume change also happen with Var 2 & Var 3?