I play in windowed mode as it's just easier for me.

Recently thou when I open my craft window the game 'locks up' for a few seconds, even the 'Istaria' at the top of the screen changes to 'Not Responding' it holds like this for a second or so then opens and everything is fine.

It gets worse the longer I am in-game to the point now where it causes me to do a re-log about every hour.