Why does my iPhone keep disappearing from my list of avalilable wi-fi networks?

Everything works out fine initially but if I close my MacBook, it can´t find my Phone again amongst the available Wi-Fi networks.
To make it work, I then have to turn off, and then on the Internet Sharing again, and now it can find it. Why is that? Is there any way to make sure my iPhone is visible permanently?

It's normal for the WiFi connection to be dropped when the phone sleeps, and will take 5 - 45 seconds to reconnect when waking.  This is a battery conservation measure and is common with most laptops when they sleep.
You can maintain a continuous WiFi connection (if your router is not set to time out) by disabling cell network data connection:
Settings > General > Network > Cellular Data > OFF

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