Squares caused by reflected area light There are squares in my pictures. I do not know how or why this happens. Anyone who has experienced such problems?

First i tough it could be the denoise that made the squares, then I tought it could be collision between the lights or maybe the texture from the table. 
I have now tried to render without the denoise, I have removed the light from the candle and moved the table. I still can`t figure out what makes the squares. Same results every time. 



I remove gloss from the lamps in the background (bookcase). It removed the squares, but I want the gloss on the table. Any way around this? 

I now know that the problem is from the area lamp in the bookcase. 
When I turn the gloss off, the problem with the squares are gone, but I want the gloss though. 
So I remove the whiskey glass and glass that is in the bookcase. I remove the emissive from the spotlights and turn down the strength from the area lamps. But I still get the squares. 
I tried a different angle, but the results remains the same.
Finally! 



I had to increase the size of the area of the arealamp. i was set to 2mm or something. So the area was to small and messed up the light. 



Want to give my thanks to Bfoot for helping me out! :D 

Now I just have to redo every change I made to correct this :P