How is your room temp? It sounds like your room temp isn't warm enough. Most likely from the season change and general ambient temp drop. And that's usually the reason why a UTH doesn't maintain correct temps when a thermostat is set ultra high.
If you maintain the room at 75 at least, the tank temps and hot spot should be normal. If you can't maintain temps, then you would have to either use a space heater or a heat lamp.
And heat pads do go bad with age. You could try replacing it.
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