Functionality to refresh the link automatically on connection loss isn't there yet, so it might be that your device isn't in stable connection or using some kind of service that is making this connection unstable.
First of all, check the signal strength of your device.
Try changing the WAN connection of the device. (Wired WAN, WiFi station mode or mobile).
See, maybe some kind of load balancing is enabled or you did some recent changes that could affect stability?
If you're not sure about these - try resetting your device to default factory settings and make sure you're on the latest firmware version, then generate a new link.