For a while now my sims 4 will flash for a second (in cas) and then I won't be able to select clothes, hair, accessories, etc.. and I have to restart my laptop.
Do you have CC? Try removing it, then delete your cache files except for the FileCache.ini file. Next, delete any lastexception files. Then repair your game. Right click on the game in Origin/EA to find the option. Try opening the game and entering CAS. If it is working then you need to go through your mods. You can try putting them back a batch at a time, checking CAS again as you go or you can try The Mod Conflict Detector program at Mod The Sims.
Comments
I hope that removing your mods/cc helped and that you were able to find the mod/cc that was causing the issue.
This link explains how to delete cache files
http://sims4.crinrict.com/en/2014/09/delete-cache-files/
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase