I had been in NLN for 35 minutes fighting the ETMY roll mode, I also ran some SQZ stuff since it looked terrible (OPO_TEMP_SCAN, then ANG_SCAN) while in NLN. I was unsuccessful in damping the mode and it eventually grew saturated the DCPDs and killed the lock, there was also increased ground motion from a 5.6 from eastern Russia during this. In the middle of fighting the roll mode I saw the 1Hz oscillation start in DHARD_P so I turned off FM8 then FM4 on DHARD_P which fixed it.