While I have not entirely noticed if it is memory related, I am having these exact same issues. Attempting to open the character/heirloom/transmog pages causes the game to freeze, sometimes unrecoverable. It also causes my entire computer to lag considerably.
This issue cost me my Mechagon run earlier as it froze my computer, and as they killed a boss prior to the game declaring me left despite having reset my comp and closed the game. I was -NOT- having this issue yesterday.