Thx you very much for the reply! Yes, I installed the Seagate Toolkit app when I began using 2 Seagate Ultra Touch (2 TB) HDD's for Time Machine backups. I uninstalled it and removed the kernel extension. Crashes continued & file speed got very high so, I just ended up running apple diagnostic which didn't show anything. Then last night I:
-Reset smc & nvram
-Ran 1st aid in recovery on start up disk (Along w/ it's container and 2 volumes)
-Ran 1st aid on 2 external backup drives
-Erased disk
-Reinstalled Monterey in recovery
-Restored my user account & data with Time Machine backup
Routined crashes (11 so far, today) started again today as soon as FileVault finished encrypting and I signed back into my iCloud account. I'm getting 2-3 crashes anytime I log in + other random times.
Btw, crashes started after 2 previous wipe & reinstalls - Both due to hash mismatch errors which seem notoriously specific to Monterey - I'm assuming the 2 are related? I'll try adding the external hard drives to the privacy preferences for Spotlight & report back.
I'll attach an EtreCheck I ran this afternoon.