Brand new S20. Phone goes into sleep mode within 20 secs of initiation or answering a call. Phone goes completely dark, cant acess keypad etc. Both ATT and Samsung support have no anwers. I was in ATT store when they called Samsung. $1400 phone and cant use it as a phone. Really? Yes smart stay is enabled, screen time out is 10 minutes. Anyone else?
By "sleep mode" do you mean that the screen goes black?
If so, this has been a "feature" since at least the Note 8. Double tapping the screen or taping a button should turn the screen back on. Then you can access the keypad, etc.