Delayed notifications with wechat (and other messaging apps)

I am using different messaging apps on my FP3, one of them being WeChat. I have discovered that often notifications for incoming messages show up on my home screen with a delay of up to 5 minutes.
I also realized that when I activate the phone and switch to wechat, I first see a “not connected to network sign” in wechat. After about 1 second being in the app messages start coming in. This happens although the app was open all the time, I just switched off the screen.
When the screen is switched on and I am in wechat, the messages appear instantnly. Only when my screen is switched off, I experience the delays.
I am not sure if this is a hardware or software problem? Could this due to an energy saving function in some way?

Looking forward to any ideas.

You probably have to allow Wechat to run in the background.

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thank you! Indeed there was the option to “not optimize” wechat for battery saving. I have now changed the setting and will observe things.