Sony xperia z3 WiFi issue after upgrading to M

[Sonyzee3]

I had WiFi problem after upgrading to marshmallow..my phone doesn't contact to wifi auto.. It needs to connect manually.. Note that the connect automatically check box ☑ is enabled...whenever i went outside the wifi range and return... Z3 doesn't connect..

[_alexdon_]

@Sonyzee3 I will try to get some info on this.

[_alexdon_]

@Sonyzee3 Check the sleep policy under wifi settings, make sure keep wifi on during sleep is set to always. It should reconnect in sleep.

[SirRobin]

But i think the doze mode may be the problem. You have to set all apps which can use wifi in sleep (doze) mode - my phone cut off the wifi connection a few seconds after standby...

[AbdelrahmanHamo]

when I turn on wi-fi and screen is off (NO wi-fi available yet) then I turn on my router ..... my phone doesn't connect to my wifi automatically until I turn on my screen (android 6.0.1) why ??

[Jamdga]

Hi.
So, after 6.0 my D6603 has issues staying connected to WiFi. It only connects when the screen is on, even if all the settings are OK. Stamina app had this solved but this service seems to be unavailable anymore.
Is there a solution to this? Or are there any future solutions being planned? If so, what are they?
Thanks in advance.