I have Tiger River Bengal tub that is doing something odd temperature wise. It won't maintain it. However, if I shutdown all power to the tub and essentially "reboot" it, it gets to temp just fine. After a while, the temp drops and the "Ready" light is no longer lit (indicates it's at the temp).
Seems like a thermostat problem, but the heat up after the "reboot" is what's bothering me.