i am working on a windows 7 machine, using excel 2010 for work. every so often when i am copying and pasting a lot of numbers, formulas, formatting, etc the file freezes and i have to restart excel. it seems as if the cache fills up easily and i end up losing a few steps of my work that did not correctly autosave. the only way i am able to continue working is if i log off my machine and log back on. it lets me work for a while but eventually it just happens again...is this a fixable issue / bug in excel or does it have something to do with my work machine?before IT replaces my system, they wanted me to see if anyone had similar issues / if there was a fix, thanks.