Harder than normal starting

Hey guys...I have had my Swinger 340 for over 2 years now with no starting issues. It still starts great cold but when it warms up a little and I shut it off...it doesn't start as readily. This little issue just popped up recently. What should I look for? I didn't change a thing. When I put the pedal to the floor it starts pretty good but you can tell from the exhaust that alot of fuel has been dumped into the carb. Any suggestions?