Undervolted2 doesn’t seem to be stable at the higher FIDs/VIDs. So I changed it to Undervolted3. So far so good.
Undervolted3 | CLOCK = FID VID | FIDx200 4x 0.950V | 800MHz 5x 1.000V | 1000MHz 6x 1.075V | 1200MHz 7x 1.125V | 1400MHz 8x 1.200V | 1600MHz 9x 1.250V | 1800MHz
Hope this works out ok.