Hello. I have an SD card in my J2, and the problem is that sometimes the write protection seems to activate for no reason, and when I dismount it and mount it again, it works totally fine.
Dismount can usually be found in the phone's settings connected to the Sd card.
@MiscoJhones can you try another Sd Card as a process of elimination.
Current Phone > Samsung Z Fold³ 5G. > Software : Android 12 ~ Samsung One Ui 4.