Late 2014 iMac Retina 5K freezes intermittently
My iMac has been freezing intermittently, suddenly stopping everything for a few seconds. I have tried doing first aid on the HD but that process stalls very soon and I have no information from it. It has a capacity of 16 GB memory but only half that much installed. I wonder if I should get the rest of the memory installed -- or is there something else I should be looking at? late 2014, running Mojave 10.14.6