Pool and Spa
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The first thing you should do, is check the filter. Remove it, and clean it. If clogged the least bit, it could impede the heater staying On, by heat-sensitive shutdown.
But there could be other things wrong, causing the problem.
I do have other answers. I don't just offer one response and leave, you know - I keep working with customers until either a good answer is found, or I cede the work to another Expert, pretty much.
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That would be a thing to try. The control board for the thermostat could be bad, yes.
But what about the thermostat itself? have you done a minimal heating/cooling test on it? e.g. trying it when it is cool, or when it is hot?
Also re-seat all connections, make sure no wires are severely bent, or frayed, or even broken-but-hanging-by-a-thread. Unlikely, but worth a brief check and a try.
Right. What I meant was, cooling the thermostat as much as possible - with a fan, maybe - before trying it, to see if it responds appropriately, or, whether it affects performance at all or the length of time the heater stays On.
Too much pre-cooling of the thermostat would of course not be a good idea.