I'm seeing this too, although it's not specific to the 2.0.x software. My Mark V has been doing this since day one, even with the orignal firmware (1.4?). Usually it will run for several hours before it locks up, so if your primary use case is hanging around the local Starbucks for an hour or two you might not notice. However, I want to run my Pineapple 24/7 as a honeypot, but that's kinda tough when it locks up after 4-6 hours.
I have been rebooting the Pineapple to recover, but it's nice to know I can simply disable/reenable wlan0 to recover. As a workaround until this is fixed I'm going to add a cron job to toggle wlan0 off and on every couple of hours of so.
