APPS KEEP MINIMIZING IN SAMSUNGJ2 prime

[iamgian23]

SHIZZZ I HAVE PROBLEM MY APPS KEEPS MINIMIZING ON AND ON. I ALREADY DO THE SAFE MODE AND INSTALL A CLEANER APP BUT 2DAYS AFTER it happen again. Also I try *#266# something like that but it doesnt work. What should I do. Im student and its annoying I cant do my homeworks and cant communicate