Probably you use some application that is incompatible or catch conflict. The OT-6030 ( and double SIM variant OT-6030D ) is well maded ( for price level ) with simple construction phone. Most defects comes from LCD cracking or somethin like. Just one i was catch eMMC fault. Phone can be easy serviced via online [http://www.alcatelonetouch.com/global-en/downloads/global-en/ONE_TOUCHI_IDOL/otu/one-touch-upgrade-s-2-8-0-setup.exe|One Touch Upgrade S] or offline via SP-FlashTool. Don't worry - it's nice phone for about the money.