I also turn off every night - saves a lot on electricity bills.

But what I wanted to say was I too have a 4G wireless modem.  However, I bought a Netgear cradle, complete with external aerials, and I haven't had drop out issues at all (obviously except for when Telstra crashed).

The area I live in has pretty high traffic, and after tolerating (??) Optus for 18 months. bit the bullet and went back to Telstra.  

I'm sure having the Netgear cradle is what allows me to access the internet at any time with zero problems.  Might be something to think about.