Standby after 15 seconds ?

After 15 seconds, my Nokia 5 screen goes out. I then adjust the time to 2 minutes but the next day it is back to 15 seconds.

Standby after 15 seconds ?

After 15 seconds, my Nokia 5 screen goes out.

I then adjust the time to 2 minutes but the next day it is back to 15 seconds.

How can I make sure it stays for 2 minutes?

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