At 22:18 (3:18pm local), noticed the H1 range had been trending down a few Mpc over the last 90min (missed this while listening in on meetings).  Then noticed that DIAG_MAIN had the following message:

20:18 SQZ OPO REFL POWER has increased

Consulted with Jenne and she confirmed I'll need to toggle the SQZ_MANAGER.  Took SQZ_MANAGER from SQUEEZING --> DOWN --> back to SQUEEZING & H1's range returned to normal.