What's going on. I've never had this issue on any of my other cars before and now this is the second time I've felt it on my 2013 SI with 75000. First time was about a week ago I wasn't beating on it but I was going around someone going from second to third gear.i shifted to third and it never caught the gear it acted as if I was in neutral. I went to fourth it caught with no problem then back to third and it still didn't catch. I went back to fourth it caught and I had same issue going into fifth. No grinding sounds nothing just acted as if it was in neutral. I pulled over shut it off gave it a few minutes. Started it up and then it drove fine as if nothing was wrong. Today I was in a parking lot reversing out of a spot with no issues, I put it in first and it did the exact same thing. I put it into second it was fine. I pulled up to a red light 30 seconds later coming to a complete stop then put it in first and it was gone again so I took off from second and then I had no issues for the rest of my 40 minute drive with all gears. What the hell is going on. Does this sound like anything specific to anyone. Only thing I have done to the car is it's lowered and an acuity short shifter which I've had for almost a 6 months with no issues. Please help.