On another forum I hang out on they discuss a variety of topics, not just cars or specific electronics, there's a thread about Apple Carplay. Here are a couple of random posts there. I'm posting just to give some perspective that not ALL the problems we sometimes have are because the T2C or Ownice or whatever are crappy devices, but that they may just be inherent to CarPlay in general. These are glitches people who use stock OEM CarPlay.
"CarPlay still occasionally completely locks up in my Honda Accord and sometimes give no indication it did so. Last week I was using Maps in my car and at some point noticed that the next turn had display 1.5 miles for around 5 minutes. I unplugged and reconnected the phone which updated the display and sure enough I had missed the turn several miles back.
CarPlay disconnects at least once a drive for me, but normally that actually disconnects. Lockups are much more rare, but they happen. The fix for both is to unplug and replug the phone in. My dad says the same thing happens on his Toyota.
When it works, it works great, I just wish I knew why it randomly decides to take a nose dive from time to time."
"My Hyundai Ioniq EV has USB as well as wireless charging for phones, but CarPlay itself is wireless only. I may have mentioned this earlier, but once in a rare blue moon this disconnect happens to my car, with wireless CarPlay, while driving. Restarting the phone doesn’t fix it. Pulling over, turning off the car, turning it back on, and trying again, doesn’t fix it either. Unless I turn it off and leave the car off… for awhile.
How long that “while” is, I still don’t know but it’s more than the 5 minutes I waited the last time it happened a few months ago, which was probably the 4th time its happened in the 2+ years I’ve had this car. This is pretty rare considering I drive it daily and I’ve loved wireless CarPlay — but it’s annoying enough. I wish it could be fixed so that it never disconnects like that, or that the car also had USB CarPlay, to have as a backup."