GoPro cameras create their own Wi-Fi network. When the app connects to your camera Wi-Fi, it needs to disconnect from your current Wi-Fi first (if you simultaneously with Wi-Fi use also the ethernet cable, just skip this section). The app remebers the Wi-Fi name active upon app launch and when it is terminated, it offers you to reconnect back to that original one - this dialog appears:

If you select yes, you will be requested to enter your original Wi-Fi password.

Subsequently, a dialog informing you about the reconnection appears and then the app terminates.

Known Wi-Fi networks are displayed in app configuration. You can force the app forget any of them by selecting the Wi-Fi and clicking Forget button.

You can also disable reconnection by deselecting "Try to reconnect to original Wi-Fi upon app termination" checkbox.

Note that list has "is GoPro" column: "no" means that the Wi-Fi is known network for reconnection.