I have a late 2011 MacBook Pro, I have had a bunch of issues with it over the years, but nothing I couldn’t fix myself. Lately it’s suddenly getting extra slow and unresponsive, right when I’m in the middle of doing something, watching a video, or just checking my emails. It will not go back to normal until I do a smc reset. (Simply rebooting will not work). I have to do this multiple times a day. And it’s very annoying. I’m afraid it is my logic board. Any suggestions? I live in Brazil, so there’s no apple store I can go to. I have High Sierra installed. Battery seems fine. But if the power cable is unplugged it will turn off after a minute or two. And then my clock gets all weird. The sleep light is also acting weird. The hard drive also seems to be working fine.