I have something strange happening on my 250 Pro XS S/N - 18791261 with 30 hours. Air temperature was 80 degrees & the surface temp of the water was 67 degrees. I had to idle through stumps for about 20 minutes & the water temp of the motor stayed at 90 degrees. I stopped for about 15 minutes & then idled back out & the water temp was varying from 127 to 132 degrees. I stopped the motor at this point for about 3 minutes & when I hit the start button, I got a high temp warning & the temp was 176 degrees. I pulled the cowl off to check things & did not see anything out of the ordinary except the motor was hot. I let it cool for about 10 minutes & the temp cooled down enough to stop the alarm. Started the motor & the water temp stayed around 130 degrees. I then idled for about 10 minutes & shut the motor down & monitored the water temp & it began to climb. The water pressure while idling was around 3 psi, give or take a tenth or 2. Once I could get on plane @ 3300 rpm & 17.5 psi, the water temp stayed around 125 the entire time & when I shut the engine down after the long run, the water temp did not climb as before. Does this sound like I have a sticky thermostat causing the temp alarm or could this have been caused from the extended period of idling?

Thanks for the help