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Help galaxy s5

Hi guys,
Two months ago my s5 (SM-G900F) was updated with Lollipop 5.0. Initially I experienced some problems with the battery life and some apps like Contacts, Phone and Messages lagging more than usual. I contacted the local Samsung's customer support and distantly they managed to help me to resolve these issues.
Unfortunately, I still experience one very annoying problem with my s5. Very often, when I put down the handset from my ear in order for example to end an ongoing call, the screen stays black for longer (2-3 seconds) than usual. It is very annoying for me because I am forced to pay extra attention to my phone instead of just touching the respective icon without bothering for anything else.
Meanwhile, I tried many actions - e.g. Factory reset; Safe mode; clearing memory etc. without success.
Can anyone advise me what to do?
 
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