That you sense it later in the day makes me guess fluid refreshment will help a bunch. 156,000 miles is way long enough on the factory fill.
I'm a fan of adding LubeGard (red bottle) at the proscribed 1 oz. / system qt. dosage.
I realize the mere mentioning of any "snake oil" can be off-putting but this stuff works from experience.
I thought to add that a bad motor mount can result in a clunk but you'd have the clunk all the time.
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