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Check to see if your pilot light is lit/on. After taking off the cover plate, try and see if the pilot light is still lit by looking inside the burner. A lot of heaters today will have a closed combustion chamber that only provides a very small window to look through, so, you might have to get in a funky position in order to find the pilot light.
This can be a common problem especially with older units. What's happening is; the dip tube on the cold side intake is deteriorating, which is causing the cold water to be mixed with the hot water serving your home.
Most likely thermal expansion. As water is being heated, the water will expand and to prevent your water heater from completely bursting; the T&P overflow will release water to relieve the unit from all the pressure it built up. Typical fixes will be, either a pressure reducer valve (at the main) and/or installing a thermal expansion tank to act as a back up.