[Alan Anderson]

The easiest thing to check right now is the power wiring to your D-Link. Make sure it's done as follows:

dedicated 12v output on Power Distribution Board (white Wago plug)
to
red and black wires on 12v-to-5v converter module

yellow and black wires on 12v-to-5v converter module
to
D-Link 5v power input

Any other wiring scheme will potentially cause the D-Link to lose power when the battery voltage sags.