apps on phone opening and closing by itself

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I did factory reset my phone because of this problem. But still the problem persists. Like a while ago, the chrome browser on my phone just keep closing by itself. I opened it again many times but it won't stop closing. Then a screen button for screen shot of my phone would be activated by itself although it didn't actually continue to take a screenshot. If this is some kind of virus trying to get some information on my phone using my wifi, so I immediately turned the wifi so it won't transfer any picture and information. And after i did that after a minute, the apps stopped opening and closing by itself. I remember installing one app from playstore and after I did that this thing started. I forgot what app since I deleted that a few months ago. Deleting it didn't stop the problem. Seems like some program are left embedded in the software even after un- installing it.