A few days ago the water in the mastered room bathroom went from freely flow fast to a slow dribble, after it had previously been running fine. The sink faucet made a noise like slurp,then no longer ran fully. Both hot and cold, turn fully on flow low to dribble. Also, not sure if it matters, but less than a month ago we had to replace our gas water heater. The new one had to have a thermal expansion tank, there has never been an issue with flow prior to this time. What reasons would cause this to happen?

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a month ago we had to replace our gas water heater

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Sounds like you might have disturbed the pipes and had trash. With the pipe walls.
Try this. Shut the water off to a affected valve and open it up. Remove the cartridge and check and clean the inlet ports. Now place a pan over the valve and turn the water back on for a moment to flush out the supply and the valve body. You get a full flow when you open the valves? Let me know. Back to you, Tom