@Kevin_Z it's not a firmware issue as it has been working fine with current fw for months if not over a year. The SD card is readable on windows and on Linux in my alternate devices. I don't seem to...

Hi I am having the same issue; App version 3.1.12 NC450 version 2.0 FW 1.5.0 Been using these since 2016 with no issue and havea 64gb sd card in it. It has been loop recording fine but last few weeks...