SanDisk Ultra 64GB MicroSD syncing issues

So i wanted to add some files to my new now formatted fat32 microsd card, however, upon adding files some would sync and then just eject the microsd before finishing the sync and windows would prompt me the “has detected a storage card window” with options to open folder, open with photoshop etc.

Is it defective, i have tried with my other microsd 64GB and it doesn’t do this. Any help will be appreciated.

So anyone on this? i have returned three 64GB cards to Amazon because of this.