Acer Chromebook 15 keeps crashing

It would be really helpful to know what browser you're using:

https://forums.adobe.com/thread/1195540

My suspicion is that we're running into a buggy hardware driver.  You can confirm this by disabling hardware acceleration. 

Instructions on disabling hardware acceleration are covered in the video troubleshooting guide below:

https://helpx.adobe.com/flash-player/kb/video-playback-issues.html

If the problem goes away, it's a driver thing that will need to be fixed by Acer. 

If the problem persists, something else is going on, and we'll need additional forensics to understand.  Please see the following guide on how to report a crash:

https://helpx.adobe.com/flash-player/kb/report-flash-player-crash.html

Thanks!