This is a 'one-off' problem, Stephen. We have never come across this in over two years of posts at the Danish G70 Club and roland-arranger.com, so I think it is hard to use this ONE occurrence to slam build quality of the G70...
Was it shipped in it's correct packing case, and was that damaged when you received it? Are there any signs on the G70 itself of impact damage or rough handling?
If they drop just about ANY keyboard, bad things can happen...
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An arranger is just a tool. What matters is what you build with it..!