I have a 2012 challenger 180 255hp with only 58 hours on it. My problem is the boat is only topping out at 42 mph and the max rpm is 7600. Less than a month ago the boat had no problem doing 50mph. I didn't do anything different and nothing was sucked up through the intake. I brought it brand new and purchased the 5 year extended warranty. Any advise on the problem would be great. Thanks