Push notifications are delayed when my phone is locked
Please tell us some basic information before asking for help:
Model Name: Asus ROG Phone 5
Rooted or not: not
Frequency of Occurrence: all the time
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
I noticed that I don't receive push notifications immediately when I lock my phone. The delay varies from 5 minutes to 1 hour, which is unacceptable. But when my phone is not locked OR when it's locked and charging, I receive notifications immediately. It happens with all apps with push notifications, eg Twitter, Telegram, PayPal, banking apps etc.
It seems that Internet connection is being cut off or it is not being kept constantly when I lock my phone. I checked all possible settings and couldn't find anything that would help me solve this issue.
Does anyone know what should I do?