You need to verify that you still have hot water. Sounds like you're running out.
You have a bad "dip tube" or one of your elements is bad. If it's an electric WH.
Dip Tube delivers cold water to the bottom of the WH tank as you use the hot water from the top the cold flows into the lower part of the tank via the dip tube if its broken the cold water mixes w/ the hot turning the hot into warm then cold in about the first 7-10 mins of use. The dip tube is on the COLD side remove the nipple (pipe) on the cold side and pull the dip tube out.Cut the new one at about 8" from the bottom of the tank and reinstall.
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