Too high memory overclock makes all readings on GPU-Z or similar programs return no data. Restart the rig, check which GPU returns no temperature, dial down the overclock and try again.
Phoenix is slightly more intensive compared to Claymore with default intensity, so if you are on the edge of stability on Claymore - it might crash with Phoenix.
Phoenix 2.7c crashes with the settings I have and with so many GPU's it will take lot of time to re-tune the clocks to match this program
Similar problem with claymore 11.2 to 11.4 but now Claymore has just released v11.5 with -oldkernel option which can be used in cases where they have problems with latest versions because they use hard OC and/or custom bioses created for old versions
any chance we can get a similar one for Phoenix so that there will not be need to change clock settings/bios mod
Drop the memory clock of all cards by 20MHz and try again. Not so hard.
Or just check the logs to see which GPU gives the temp error and reduce its clock.