Doubt those drives were from bad batch. As these were SSDs, most likely write wear. Two SSDs should never be in RAID 1 pair or replace at least one SSD in RAID

Doubt those drives were from bad batch. As these were SSDs, most likely write wear. Two SSDs should never be in RAID 1 pair or replace at least one SSD in RAID 1 at predetermined schedule instead of replacing on failure only. They are going to wear off at same pace and will fail about the same time.