ADE keeps freezing and resetting my book, especially on my kobo... Help?

ADE will freeze and 'not respond' while I am using it on my computer. When I try to read on my kobo, it will freeze after every few page turns, and eventually say that I have finished my book, even though I am only partway through. It also takes forever to open a book, or turn a page on my kobo. It will not save bookmarks, nor allow me to scroll through the pages, using the scroll bar in the bottom menu.

Any ideas, tips, tricks, help??