Same here. Version 8.x crashed so often that I use the 7.x version except at the time of formating in word because the 7.x is not compatible.
The only new “new feature” of the 8.x version is to have corrected a bug that prevent its use in word 2016. I see no decent reason to be forced to pay again for that !
I check the alternative… it is time to shift to Zotero I think. It will be boring to move my 10000 bibliography with pdf; it will take me one full day but I cannot work with the actual version of endnote. Pity end story. I used endnote since version 2 I think.