It seems to be pretty stable now. I've been using an iPad Pro as a 2nd monitor for a MBP while working remotely over the last year without any issues (8+ hours of daily use).
I frequently use it on an Ipad non-pro, with 3 different macbooks over the last few years, both over wireless or cable and it doesn't reliably stay on for more than an hour at a time.
gomox|2 years ago