@388a5698 Well I can tell you that I have seen a tight time reset or loss of signal once and that was in Michigan.  One of the routes of the cable went near an industrial facility and when they fired up for a shift everything downstream of that location would lose internet. 

4 AM reset does lead me to an external event triggering the modem to reset. My normal debugging of this would be to swap the modem with a known working one from another field location and wait and watch.