PokerTracker

When I automatically 'get hands while playing' it imports around 50-100 hands then stops and says 'adjusting session stakes' which takes around 20 minutes after which it says 'updating the cache' which takes about 2 minutes to compete. Then the whole process starts over. Why does it have to do this after every few hands? Thanks

This happens due to Automatically Apply Treat As -- you can turn it off via Configure -> Sites & Import Options -> Settings. That setting helps make sure things like (6max) are properly applied, but it sounds like it's going off more than is useful for you.