Road Hog 4 question

I'm running a RH4 in 2.1.2 driving out the 4 hard dmx outs and a external (4) DP 8000. when I normally power down at the end of the night and come in the next day, The DP 8000 responds no problem all is good. But if I power down and wait a couple minutes and power up the external fails and I have to hard reset the external DP. Has anyone seen this??