I did an update about 8 hours ago. As far as I can tell, the problem’s getting worse. I connected my sixaxis controller via bluetooth and in 10 minutes I encountered two freezes while trying to play Mario Kart 64. One while the game was loading and another after restarting, and playing for about 3 minutes.
On a completely unrelated note, the mupen-rice emulator, which is default, doesn’t display any video anymore, but 64plus is ok.