Wifi not connected to internet, daily

So if you can restart the gateway with the mobile application then the Wi-Fi is up and operational. Does the gateway drop the cellular signal or do the clients report no internet even though the gateway shows it is connected to the primary and secondary cellular signals? If it reports the cellular signals are there but clients report no internet that can be they do not obtain DNS resolution. In that case go into a client's IP address settings and add say 8.8.8.8 and 8.8.4.4 for google's public DNS servers instead of the gateway IP address. If the client then works it was an issue with DNS name resolution. 
Some users have reported issues with the SIM card holders in the Arcadyan gateway and it seems some do not hold the SIM cards secure so the contacts might not be secure. Some users have had success with simply reseating the SIM into the holder. This does entail powering down the gateway first. The reason this might be related is that the SIM card retains the important information regarding the user's account services. A reboot might just be enough to make that part work again. It is hard to say for sure if that is the problem. The issue might be with some other problem with the gateway or with the tower/cell operation. Reseating the SIM card is a simple task and takes little time. Some users have made a shim of sorts or make sure the holder secures the SIM better for improved contact. If you search the community conversations for SIM you can review them and see if the boot fits or not.