crwdns2933897:0crwdne2933897:0

Horizontal lines in corners of my screen

For a month now, horizontal lines (see picture) have been appearing in the right corners of my screen.  What is this about?  

How do I fix it?

Block Image

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crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
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