Menu button stops working
Both times it's happened have been while I was using Dolphin Browser and then went to exit the app. I would press the menu button and absolutely nothing would happen, forcing me to exit via pressing the back button a bunch of times. Hitting the menu button again upon returning to the home screen would do nothing. I would try killing off some apps from the task switcher; still nothing. The only way to restore the menu button is to reboot.
I've read of others having a similar problem, but it involves both the menu and back buttons ceasing.
Any thoughts, advice?