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Sounds like it could be several things.
Because you stated dial I'm assuming single handle mixer.
There may be a frozen bressure balancing valve causing a reduced flow of hot water.
There also may be under the handle of the valve a high limit stop that is set too low. Frequently this time of year the cold water supply is much colder than in the summer and requires a larger amount of hot water to get the temperature you desire. If this stop was set during the summer it definitely needs adjusting.
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