I don’t know if this is a new one or not, but on one of my Hikey960’s (I own 3), which has been exhibiting boot instability problems for several months, suddenly a couple of nights ago, lost all wireless and USB. The schematic identified the RT2515H as the only thing in common (although it also relates to the HDMI, which continued to function…). Sure enough, the RT2515H had 5V coming in, and 0V coming out.
So now I’ve got 3 wires soldered onto the legs of that chip and running to one of these;
… boot stability problems appear to be solved.
Box of RT2515H’s now on the slow boat.
Funny that just a couple of weeks ago, I finally decided to buy a hot air rework station, which will be needed to melt the solder from the thermal pad.