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Circling back for any future readers of this thread. The root cause looks to have been a bad mixing valve in one of our showers. Now that it has been replaced, the problem appears to have disappeared (fingers crossed).

In the last year we've had the water heater and kitchen faucet replaced, but this problem predated both of those. There is no Y on the washing machine lines. I'll have to run some more tests.

My home has a hot water recirculation pump installed that doesn’t use a dedicated return line (The Grundfos Comfort System). This setup uses a thermostatic bypass valve at the far end of the loop in the 2nd floor master bathroom, so that the cooled water in the hot water line is pushed back to...