Bad Sd card headaches

Update: The Kingston card worked OK for about a week after the phone format. It is now dismounting and not being recognized by phone. It is in its death throes again. I have it back again but will probably lose it in about a day or two as this pattern repeats itself a few times before the card finally dies. Fortunately I am backing up everything daily. I wish Samsung would increase internal memory to at least 64Gb. Is there a vendor that can install larger internal memory? At this point I would be willing to pay for that.

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