While memorizing, when you reach the buffer it can mean one of three things: 1. you are done with memo and all the pieces would be solved, 2. you have a flipped edge/corner or 3. you still have unsolved pieces and need to break into a new cycle. First you need to figure out which of these it is, which can take some practice at first. If your buffer is flipped then you either have a flipped piece or there are unsolved pieces and you need to break into a new cycle. Go through your memo really quick on the cube and make sure that all the pieces would become solved with your memo, checking for flipped pieces at the same time. To switch to a new cycle switch the buffer with any piece that still needs to be solved. Pick one that will be easy to memo, and then keep memoing until you reach your buffer again. PS, it is possible to have to break into two new cycles, so be aware of that as well.