Hello, Have you tried disabling "Use OpenGL vsync"?
Here is a discussion of possible associated problems (both OpenGL and not):
http://www.gossamer-threads.com/lists/mythtv/dev/272433
Please report back if any of these ideas help to resolve your issue.
** Changed in: mythbuntu
Status: New => Incomplete
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livetv freezes randomly
https://bugs.launchpad.net/bugs/310178
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