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If it is still happening ...
And esp if this was the first time out after dewinterizing...
Double check the positioning of the water heater bypass valves. Many have multiple valves, usually including one that allows the cold water to run in the hot water lines. If that valve is left in bypass mode but the heater in & out valve(s) are open then it is possible to get alternating temp water. It has to do with the heated water in the tank expanding and entering the line and with a faucet open that hot water moves along followed by cold from the open bypass valve.
At least that is the explanation I read some time back. I'm not sure how it keeps alternating but probably possible.
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