Xvis1

I have an XVision X16D1H with 8 IP cameras. I've had this for years and it's been fine, but recently it's stopped working properly. It'll be working, then every 60 seconds or so, it'll beep and it looks like it reboots. I also can't connect to it remotely. It connects to the user interface, but before the camera displays come up, it'll reboot again. The cameras are displaying on local monitor, but again goes off when reboots. Disconnecting all the cameras at once and then reconnecting seems to fix temporarily, but the next day it gone again. Any ideas?