So I own a 2012 Mazda 3 Skyactiv with the 6AT. A recent issue it's developed is that when I put it into the manual shift mode (mainly to listen to my exhaust through town), is that it doesn't like to shift up a gear. It shifts down fine, and I've made sure that I have plenty of RPMs to play with when shifting up, but it doesn't seem to want to do it. Typically I've had to try and shift it about 3 times before it'll register. I don't want to take it to the dealer if I don't have to, because I definitely can't afford a large bill. Any help with this would be appreciated.