I am sorry to hear that your phone is acting up. Here is what you have to do:
(1) Hold down the power button until a menu appears. Select the "Power Off" option and the phone will shut down. If a menu does not appear, continue holding down the power button until the phone shuts off. If that does not work either, remove the battery from the phone.
(2) Wait about 2 minutes and then turn the phone back on. (If you removed the battery, put it back in after 2 minutes.)
(3) To prevent 360 Security from giving you problems in the future, uninstall it. To do so, click on the Settings icon, go to Apps, and locate the 360 Security app. Tap on it and select Force Stop and click "Yes" on the message that pops up. Once that button greys out, click on Uninstall and follow the prompts.
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