Sudden distortion in speakers

Thanks for the suggestions. Seems like the distortion is only in my center speaker. In surround mode the other speakers are OK.

I guess the next thing is to try changing speaker cables?
 
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After cleaning it and reseating the cables, it seems to have sorted itself out! Thanks for the tips

It's now OK but after a while, maybe 30 mins, the distortion comes back. If I turn it off and leave it, then turn it back on, its OK for a bit.
 
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