Im having the same issue so i tried googling and came across this thread. I've read it all so far but it same to have stopped march 21st and its now July 11? Was there a solution? It seems ever since I updated last week when it gave me the notification last week i can update malmare bytes scans a lot slower.. idk what they did but they needed to undo it. And since i Dont have an SSD it takes me even longer. Hint: it took me 13 hrs for a custom scan full with root kit/ etc and It never finished cuz i canceled it due to frustration.