One thing I've noticed with the new guitar is that if you move it around a lot it can loose connection, damn waste of time detachable neck. See the neck has little round contacts and a standard sprung contact on the guitar, but the neck has quite a bit of give in it so can easily loose contact (from what I can figure out).
On my guitar, I rolled up some scraps of paper, and put them in the screw holes on the neck, cut the rolls of paper down so they left about 6mm, then forced the neck back on. I got mine working much better doing this, but if your gonna follow suit then be careful, don't want to be responsible for any borked guitars. I think the safest bet is to watch how your have to put the neck back on, you want some, but not too much force - then the neck should be a pretty snug fit and the contacts remain intact.
This is not a huge problem on all guitars, like my guitar and my little brothers both have this problem, but a friend has no issues, neither does my sons guitar. Incidently we played through the co-op career last week, it has to be the most fun I've had playing a game this decade! - don't let those dodgy guitars ruin the game for you, take action
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