I agree: I would never use a memory card that seemed to malfunction. You can get a 64 GB SD card for $11. Not worth the risk.
A couple of weeks ago, the thumb drive I use to sync between my computers showed an error and had to be repaired by windows when I plugged it into one of the computers. It seemed to work fine after the repair, and I suspect that I caused the fault by pulling it before the OS had fully ejected it, but I immediately ordered a replacement and threw out the old one.
I've been using only SanDisk CF and SD cards for years and have never had a failure. The only problem is that they are so reliable that I don't think about replacing old ones when I probably should.