Help with 2008 GTX 155

[blksheep]

May 09 bought 2008 Seadoo GTX 155 brand new. No issues took in for 10 hour service took back onto water no issues put another 3 hours on. Didn't use for about 3 months put out in water two weeks ago smoked a bit had loud boom then couldn't get it past 30 mph. Power would die down and spurts of power then completly died on me in middle of intercoastal. Had to get a tow. Took to dealer who said oil was over 3/4 of a quart. This was from when we had our 10 hr service. Dealer said oil overflowed and burnt out all spark plugs. Ever hear of this happening?? Dealer said they fixed machine but it if happens again gonna have to replace spark plug covers??? Don't know why they wouldn't do in first place. Went from dealer to water and barely ran then died AGAIN... And now being told this stuff isn't even under warranty?? Need help as dealers have blown us off and Seadoo imossible to contact. Any ideas? Thanks!