I thought I had a failed battery problem so I changed it out with a new one [Deka ETX30L]. However, it did not correct the problem. The ski will immediately start up when it is cold, but will not start up again after I run it run for a while, shut it off and an attempt is made to re-start it. The engine turns over but just will not start.. But when I reconnect the battery charger, the ski would start up again. [Both the battery and charger check out OK]. Any ideas? 2007 SeaDoo GTX 4 Tec. Thank you!