Tesla Motors Club

I just got 2 Powerwalls and a Gateway 2 installed last week. I had an existing 22 panel, 5.7 kw solar system with Enphase M215 inverters. The panels are arranged in two strings - one with 14 panels and one string with 8 panels. These two strings feed into a subpanel with two 20/2 circuit breakers and from there are connected into the main panel via a single wire. Initially, after the Powerewalls were installed and the system was powered up, 8 of the panels were not generating power according the the Enphase Enlighten monitoring program. After flipping the breakers in the solar subpanel off and back on again, the 8 panels "woke up" and began generating power. However, I am noticing that in four of the last five days, those same eight panels are going dark for anywhere from 45 minutes to an hour and a half. This happens around noon time when solar production is near its peak, but not at exactly the same time every day. The Powerwall batteries are nowhere near capacity when this happens. Any thoughts on what might be going on?