Shuttering Sound ?!

I use new SAMSUNG / SANDISK Endurance 256 GB microSD card, in exFAT, with a new WYZE Battery Cam Pro. Recording to microSD card stopped after 2 whole days and has more than half its capacity untouched. I found this out when I arbitrarily pulled out microSD card on day 5 to review footage. Also there seems to be numerous and random lens shuttering sounds during that time which Idk if its normal.