Congratulations on being another poor owner of a substandard Roland product, mine is a JV2080, but is the same problem.

All I can say is everyone out there who owns a JV2080, XP80/60 or whatever who experiences this problem should write to Sound on Sound/ Future music etc. It is the only way this will reach a larger audience and embarrass Roland to get off their lazy and unhelpful backsides and sort this.

Cheers