I have had my cameras for about 2 months now and everything was working fine until last week when i got the "please check the sd card" error. I thought it was just full (its 64gig.) but then trying to reformat and clear it was almost impossible. I finally got it completely erased and formated but the camera still said there was problems so i just resorted to getting a new one because i wasted hours on it already. After i got the new sd card it seemed to work, i formatted it and there were no errors but now the back camera doesn't record at all, as well as the most useful thing, the wifi!! The wifi is not working at all. I have restarted the wifi and camera numerous times but nothing. The wifi light pops up but there is no listing under wifi for it. Ive tried on 4 different devices and nothing pops up (yes i was in range, like 3 ft from it) so now im stuck with crap. The front one seems to be recording, but not only is the back one not working, my wifi isn't either so i cant even pull the cameras up to check.