Sandisk cruzer 16GB became read-only

SacanDisk has software on the Flash Drive that changes it to a Read Only if the Drive senses something is wrong with the Oerating System. I received a replacement ScanDisk Cruz 32 GB from ScanDisk. The first thing I did was reformat the ThunDrive to NTFS so I can save fiels larger than 4 GB as 1 file and delete the ScanDisk software that can create the Read Only.