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Hi jraym17,
Welcome to the community,
When you say it closes the program do you mean you get an error message and then it crashes or it just simply shuts down?
Please do not create other thread on the same subject:
/t5/Xperia-Z2/Sms-app-crash-in-ultra-stamina-mode/m-p/962958#M24888
/t5/Xperia-Z3-Compact/Message-App-crash-in-Ultra-Stamina-Mod/m-p/964745#M9029