I have a 1999 Bayliner 2655 with a 5.0 and a bravo 3 out drive. When first hit the water it runs great good throttle response and quick to plane. After 30-40 minutes into the day it starts to slip and gets really sluggish. When I throttle down and start again it won’t pick enough speed to even come to plane. I still idol around and get the motor up to around 2500 ramps and it will run smooth but not fast. If I try to push it up 3000 or 4000 it does the same thing all over again. If I take a break and swim or fish for a while I can go again just like the start of the day. Any ideas or suggestions?