The device has worked perfectly for the two years I've had it. Everything else (net browsing, email, book reading, picture viewing) is still fine but video stutters and freezes accompanied by a faint screeching sound instead of the audio track. Music files barely start and have the same screeching noise, Is my tablet kaput ?
Sounds like your BlackBerry PlayBook had had exposure to moisture (water) . I recommend the rice trick and then a security wipe clean and reinstall of OS from PC connection.
You have my sympathies. I lost a BlackBerry Curve device to water moisture.