When Ppro starts everything seems fine. When I click to a Word document (the script) to check something and come back to Ppro, there is no playback. Actually it's not just a Word doc, taking focus away from Ppro to any other program, then coming back to Ppro, causes this issue. This just started happening so not sure what has changed. The only way to get playback started again is to close Ppro and start again. One time I had to restart the laptop entirely.
All software and drivers are up to date, so that's not the issue.
You do not give any hardware or system specifics.
Open a project in Pr, and have your doc open too.
Start your task manager or activity monitor and look at the tasks and the system resources for RAM and CPU. Make note of how much is being used by which tasks.
Do the sequence you say causes this behavior and look at the monitor again. What has changed? CPU and RAM use or something else like another program starting too, or a cued web access by Word?
How is your Adobe RAM use set up in prefs?
What about disk access. Is everything on the same disk?