Multi M1 sattelites keep disconnecting

I have a set of 3 Muly M1 units and the 2 sattelites are disconnecting every few days. I can see in the app that they are offline (although I believe they are still turned on and online, just not connected) and need to physically reboot them. This is very annoying and especially as I can't reboot them remotely. Why is this happening? And why can't they be programmed to reboot themselves if they loose connection connection? P.s. I have the latest firmware installed.