To avoid interference with other Wi-Fi networks, try using a different channel.
From a Home screen, navigate: Apps > Settings > Mobile Hotspot and Tethering (Wireless and networks section). These instructions apply to Standard mode only.
Tap Mobile Hotspot.
Tap the Menu icon (upper-right).
Tap Configure Mobile Hotspot.
Select (check) Show advanced options. You may need to scroll to the bottom.
From the Broadcast channel section, select an option: Selected when a blue dot is present.
2.4 GHz
5 GHz
Tap the Dropdown menu icon then select a channel (e.g., Auto, 1, 2, 3, 11, etc.).