Who I have the same questioned this topic

Within the past month, my 4G LTE Network Extender (SLS-BU103) has been restarting itself around every 12 hours.  It had no issues for about 6 months prior to that.  I have tried power-cycling it, doing a factory reset, reducing the transmit power to 33%, and limiting the backhaul to 100Mbps.  Nothing else about my network has changed in that time.  It will restart successfully after about 20 minutes, but GPS signal issues (depending on weather) can prevent service from being restored immediately.  There are no logs about the failure, the first entry after restarting is "Boot Complete".

Does anyone know how to fix this?

I don't have a Verizon account; I'm using the extender for a device provided by my company (Galaxy S7) and a personal device (Essential Phone) on a Verizon MVNO.  I bought it from a third party.