These Onn brand cards from Walmart could possibly be the problem. Have you tried a different brand SD card like Samsung or Wyze brand? These are the two brands I use in my cameras and I haven’t experienced any problems with them so far.
If the Onn brand cards are bad, you always can return them to Walmart for a refund. 
It looks like you chose the Android tag when you created this topic not a big deal. You could have selected not-phone-specific.
There are several threads already started with the same issue that you are experiencing like this one below: