No internet when I lock my phone

[DDr23]

I have galaxy a8 (2018), whenever I lock my phone, after some time suddenly internet is not working.

I dont get notifications from chat apps etc. and also for example if Im logged in with WhatsApp web, some time after locking my phone, I get no connection error on whatsapp web, when I unlock my phone suddenly i get all the notifications and it recconects to whatsapp.

I know for sure its not just with whatsapp, I dont get any notification from an internet depanded app when the phone is locked.

I checked and data saver is off, notifications are allowed, background activity is allowed, background data usage is allowed, Put app to sleep option disabled in device care, of course do not disturb disabled.

It is also not depanded on WiFi/Mobile data, I mean it happnes on both.

Any ideas??? 

It gets me crazy!!

Model - SM-A530F

Android version 9

One UI version 1

It is up to date.

[AndrewL]

@DDr23: If you go to Settings > Connections > WiFi > Advanced > Keep WiFi On During Sleep > Always, does this resolve your issue?

[DDr23]

I dont have such an option

[Robertmonge]

I dont have such an option. And suddenly started to happend the same... when phone is blocked it, internet is shuthing down...

[Abadir]

I have same issue so I fixed it by changing metered connection to unmetered connection. Go to Advanced -> Metered network->Treat as unmetered

[Designw24]

[Abadir]

Do not go to settings instead select the settings button in right cornet of the Wifi Name you are connected to then follow the steps above.

[Designw24]

I don't clear about what you say🥺 can you please take a screenshot for helping me please😓

[Abadir]

[Designw24]

Thanks for your kind information.. Thanks a lot