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My screenshots for the wifi settings are from a Samsung device.
My screenshots for the dummies tutorial are from a Samsung device. The steps may be different on other branded phones, but in general, the options should be the same.
There are 2 tutorials:
- For the techies..
- For the dummies with screenshots included.
both are the same steps.
For the techies among us…
- Open Wifi settings.
- Go to the 3 dots.
- Select Advanced.
- Search for Wi-Fi power saving mode and turn this off.
Let’s fix your wifi on your Android device for the dummies among us.
Swipe down to reveal the buttons.
Keep your finger pressed on the wifi button.
This will open the wifi settings.

Open the 3 dots at the top right of your screen.
Open Advanced.

Here you see a lot of settings.
In between is also the setting Wi-Fi power saving mode.
Make sure this option is Off.

How I ran into this issue?
My mom had finally decided to get a smartphone. What a drama that was the first few months. She had no idea how it worked and was also constantly getting advertisements and other crap.
Eventually she succeeded a bit until WhatsApp suddenly did not always give a notification, but only gave a notification when she was using the phone.
Of course she made me look for a solution again, so here you have it.. a new tutorial.