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I've been witnessing runtime manipulation of my apps like keep notes, Evernote. Letters get deleted while typing, noticed changes in already written notes. It seems that someone has unauthorised access to my android phone.

Also I don't receive app notifications which I've turned on.

Can I prevent data manipulation and secure my Android? How to prevent data breach?

closed as too broad by beeshyams, Andy Yan, xavier_fakerat, iBug, Akhil Mar 13 '18 at 6:25

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.