Do you have the same issue if you follow the OP’s steps to reproduce it?
Provide extra information to complete the original description of the issue:
Boeing 787X KDEN to KSAN, the ATC freezes up. It happened to me 3 times. once yesterday as I was pushing back, and twice today. Once before I even pushed back ,and again as I was about to take off. I had to abort the flight each time.
I an running FSLTL with this as well.
If relevant, provide additional screenshots/video: