I don't understand what you are saying.. How is it not a Beta 3 bug? Are you implying that this is an intentional feature...?
This is obviously a Beta 3 bug... It has happened to me several times.
Also, an fyi, theres no need to wait "a few hours".. Simply hold both the home button and the power button for about 10 seconds and your phone will reboot.. All will be well. People really need to chill out.. The complaints I read here on a daily basis about how the beta OS is not running perfectly is absolutely retarded..
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End users troubleshooting software issues while running a Beta OS is pointless. How can you knowingly run software that is not finished and expect everything to run smoothly? "It's a beta" is not a "cop out", it's a legitimate and relevant fact that pretty much ends the conversation about any software related issues you may be having.