I have similar issues with AcroCEF on a PC. I have three PDFs open and am using comment functions. Eventually the fans get noisy and Acrobat (DC) will freeze. At that point, in Task Manager, I can see multiple instances of AcroCEF where I would normally see the names of PDFs that are open. Have to force quit, restore, and then check that none of my comments have been lost. Repeatedly.
I have similar issues with AcroCEF on a PC. I have three PDFs open and am using comment functions. Eventually the fans get noisy and Acrobat (DC) will freeze. At that point, in Task Manager, I can see multiple instances of AcroCEF where I would normally see the names of PDFs that are open. Have to force quit, restore, and then check that none of my comments have been lost. Repeatedly.