I can temporarily get rid of the problem by unplugging the USB cable to the standard unit, then plug it in again and then restart the miner.

Then it will run for maybe half a day before becoming erratic again, as shown below:


It seems to me there is something wrong, either related to the USB ports (they are fickle and often don't work) or maybe related to total power requirements of the OrangePi not being met at times, so that either an extra USB plugged in, or the HDMi cable plugged in will kick it over the edge into malfunction.