Sea Doo GTX Supercharged hard to start after 30 min. riding. Any Suggestions?

sounds like what's called a "hot soak restart".it's usually caused by the evaporative emissions system. this system vents fuel fumes from the fuel tank to the air intake,to keep them from escaping to the atmosphere.i do mostly outboards now,so i can't tell you the cure,but try this: the next time you use it,when you get to your destination,remove the fuel cap.if the engine starts normally when you are ready to leave, there will be a plugged/crimped line,filter etc. in the system.there may even be a recall.might check with sea doo's web site to see. good luck!