Could be it needs a new $15 or so PRV.
Turning the water temp setting down may help.
Could be your water supply pressure is too high, check it and if over 80 PSI or so install a PRV on the main water supply. (We had a house with incoming city water pressure that sometimes hit 230 PSI when the city was filling the water storage tank near us - they also blew pipelines in the street a couple times a year)
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