Question [Q] SD card doesn't work after sometime, only restart solve the problem

Hello,
I don't know why, it seems that my SD card doesn't work after sometime. I could not update the apps installed in the SD card, i could not save photos to the SD card. After a restart, the SD Works again, until sometime later the problem appears again.
(I used nextapp SDfix to unlock the SD card.)
Does anyone else has the same problem?
Thanks,
Martin