Total NAND Writes are 181 times the Total Host Writes! Please help!

what FW is on the SSD? Install the sandisk ssd dashboard and check if there is a FW update available. there was a write amplification issue with one of the older FW versions IIRC. that could explain what you are seeing. Since it is pretty bad at this point you would probably need to contact sandisk support for a warranty replacement and make sure the FW is up to date on the new one when you receive it.