There's a complex intersection near my house where my aftermarket Atoto CarPlay head unit will also reliably disconnect. Fortunately, after a firmware update to the head unit, it will now at least reconnect automatically; previously, I'd have to disconnect and reconnect the phone.

(Without any data to support,) I believe it to be a complexity of map issue (maybe causing a buffer overflow) rather than an RF/WiFi interference issue. It seems far too repeatable for it to be an RF issue.