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I have a 1990 Yamaha 90E on my 1990 Montauk 17. Two trips recently when running at 3-4200 rpm in choppy conditions the temp alarm has come on despite visual confirmation of good water flow through the engine - steady stream coming out without stopping when the alarm went on. It seems like this has happened when pounding in the chop. When I throttle back and shut down/restart right away the alarm stops and all is fine until the next hard impact. Does this sound like a loose wire or a sticking thermostat? I do believe I sucked up a little mud earlier in the day this first happened but I was definitely getting good flow after revving up. Any thoughts on the problem or how best to diagnose it?

Thanks in advance!