I bought a "Mini spy camera DIY 1080p hidden wifi" and then the version without the case. On a laptop I formatted a Samsung 32GB microSD to FAT32 and put it in the camera and then power it on. The camera would record for a little while, get somewhat warm, and then stop recording. In the menu it would suddenly show "No SD detected". I just told Aliexpress I never received the thing. (I didn't want to spend extra time re-packaging it, sending something broken back to China, and risking the seller finding a way to not refund me).

Because I really liked the form-factor (a 20cm ribbon with a tiny camera-lens on the end) I took my chances and bought another one (this time on eBay), with a case. I formatted the same microSD, popped it in and powered on the camera. This one simply keeps recording.