This has been going on for weeks now and it is only on MN. If I try to hover over a thread to click on it, it randomly clicks a thread five lines up (or down depending on how it feels that day). To click on something I have to wait 20 seconds or so to see what thread gets underlined and then gradually move the mouse to some random point on the page until the thread I was interested in is underlined. Half the time it will decide that I didn't actually want to read a thread I wanted to click on the ad 
And then when I want to type there is a ridiculous lag.
I use this site multiple times a day but this is putting me off now. I simply don't have the time for it. A fix would be appreciated MNHQ