I did unplug the camera and reinstall with the use of the hard reset button on the base which seemed to help

I can't even remember how many times I've hard reset this thing

It can go offline unexpectedly and sometimes requires a hard-reset, which means you need to set it up from scratch.

After spending many hours on the phone with offshore tech support, allowing remote access to my laptop for trouble shooting, physically uninstalling it 3 times as required for a "hard reset" and reconfiguring via Ethernet, it still does not connect to any Android devices.

and they tell me to contact directly to amcrest, amcrest support only tell me to make a hard reset but did not work, now amcrest support don't answer my emails

I upgraded my camera to the latest firmware did hard reset per instructions reconfigured

I use a 32 GB scan disk card, I try to format it with FAT32 from my pc, I make a various hard reset to Camera, and with the SD Card inserted

I changed wifi password and am having to do hard reset on each of my cameras.