The most important question: What was your commit interval on the filesystem?
Armbian for examples uses:
commit=600to flush data to the disk every 10 minutes (/etc/fstab)
which allowed me to have sd cards in SBC’s for over 5 years with no failure 
The most important question: What was your commit interval on the filesystem?
Armbian for examples uses:
commit=600to flush data to the disk every 10 minutes (/etc/fstab)
which allowed me to have sd cards in SBC’s for over 5 years with no failure