Audio not syncing with video

[Reegreg]

I've had xfinity for barely a month and my audio doesn't sync with my video.  I've upgraded my HDMI cable from a suggestion I read on line, but the only thing that helps at all is to disconnect it for a few minutes and then everything is in sync for a couple of hours.  I have a six-month old LG tv.  How can I get this fixed permanently? 

[rknida]

Audio doesn't sync, picture and audio jumpy. Suggestions?

[Comcast_Support]

Hello all, if you still need assistance please go a head and create another post and we will gladly assist.

Thank you