Strange. Only thing I can think of is maybe to reset all network settings on Android to see what happens. Btw, next time you to go somewhere with public WiFi, if you see that the phone connects and stays connected, it could mean that a setting on your modem or router could be causing the issue, but it seems unlikely if your other devices connect fine and stay connected.
If your device is unable to connect to your home Wi-Fi but connects to other networks (like store guest Wi-Fi), it could be due to an issue with your home network settings or your phone's Wi-Fi configuration. Here are steps to troubleshoot and resolve the issue:
Restart your phone: Power it off, wait a few seconds, and turn it back on.
Restart your router/modem: Turn it off, wait 10-30 seconds, and turn it back on.
Forget and Reconnect to Wi-Fi: Open Settings > Connections > Wi-Fi. Tap on your home Wi-Fi network. Select Forget. Reconnect by selecting the network, entering the password, and tapping Connect.
Reset network settings: Go to Settings > General management > Reset > Reset network settings. Confirm the reset. Reconnect to your Wi-Fi network.
To rule out issues with your phone, try connecting to a different home Wi-Fi network or test using a mobile hotspot from another device.
