Not a plumber, but spent many a night in the basement soldering pipes "I should be up in about half an hour honey"...
Sounds like you may have a bad valve, sometimes the screw holding the washer rots off and the washer chatters. Do you have a check valve in the line, that could be chattering as well. Look for a restriction of some sort, valve not all the way openeed etc. Hope that helps.
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