maybe theres something wrong with the slide bar, its registering strums when it shouldnt.
as you cant use the slide bar in rb or gh3 it wont effect it.
you could either try to take it back to where you bought it or go here
https://www.riverstarsoftware.com/RI...ubmitCounter=1
and fill out the form for a replacemnt guitar, however i think they now require you to send part of your guitar to them. when mine broke they didnt ask you to send anything in and maybe people were just applying for a free guitar and they probably cottoned on to that scam.