Galaxy s4 turnon and keyboard lag issues

I'm not sure if anyone else has run into this but I have had my s4 for about 6 months and lately whenever I put my phone to sleep by hitting the power button and try to turn it back on a couple seconds later, the screen stays black and off and if takes a while for me to then try again and the screen to come up. After the screen comes back up I try to put in my password and when I try to make the pattern it lags and doesnt register that I did the pattern. When I manage to get into my device it takes a few seconds for my keyboard to recieve my imputs. If I didnt't make much sense I am sorry I tried to put this into the best words I could im just done with having to wait so long to use my phone.

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