Several of these brand new modem/routers running on 4G+ went dark after two months with all top cover lights off. Power button in and unit powered. Internet found to be Offline. Simple reboot of power either by power button or power plug in/out fully restores each. Seems like a full cache issue given several fit at the same time in different locations hundreds of kilometers from eachother all went off the same day. Not a service outage. The dark indicators points to a lock up of a clock chip of sorts. Re-boot sorts all. Anybody else seen this? Firmware is the latest. Melbourne store purchase.