KC400 SD card not overwriting old recordings
I recently set up a KC400 camera and installed a Sandisk 256 GB Class 10 / UHS 1 microSD card. I have 24/7 recording enabled, and it's been doing just fine over the past month until now when it's run out of storage. I expected it would overwrite the oldest recordings but instead it's done nothing and no new recordings are being made. I've gone into the app and attempted to re-format the microSD card without any improvement. Checked the firmware and reinstalled the app on my phone without result as well. Any ideas as to why it isn't overwriting as expected? Or, given that it isn't, I can't reformat the SD card to free up space?
Device Info:
Camera: KC400, Hardware 1.0, Firmware 2.3.7
SD Card: Sandisk SDSQUA4-256G-GN6MA
App: V 2.36.0 Build 1035