I have had the black screen/freeze as well on my 4500. It happened on the interstate in the middle of nowhere. I tried powering the 4500 off/on and then power cycled the phone. Nothing worked until I pulled over and cycled the ignition switch. Then everything returned to normal
thankfully, this only happened that one time during my first week of ownership. i've now owned the radio for more two months and i have enchanted two other types of glitches:
- once on a road trip, 2 hours in, the map disappeared from 4500NEX and i couldn't get it to reappear. i ended up fishing my phone out of my pocket and slapping it in my old iottie mount and used it the old fashioned way. when i arrived at our destination, i looked at my phone and saw that i thought it was still connected to the Pioneer Wifi network...so something went wrong with the head unit and CarPlay. after we resumed our trip, it was fine the rest of the way.
- twice this weekend at the exact same location, i lost CarPlay maps. for the first time ever, i was patient (since i knew where i was going) and went into the main audio menu and played around with the carplay/phone connection button. in both cases, with a combination of toggling between the inactive phone symbol and perhaps getting far enough away from whatever may have caused the disconnection*, i was able to reconnect my phone and Maps resumed.
* i am suspecting that somehow my phone connected itself with some other wifi network, but i am not sure since my phone was in my pocket and i was driving. i really wish there was a way to look carefully at preferred networks and order the priority of networks to join. i don't think i have any auto join networks beyond work and home (i have long killed Xfinity which was a problem even before the CarPlay days), but i wonder if somehow i'm connect to an ATT wifi or something else (since i'm on AT&T)...