To avoid interference with other Wi-Fi networks, try using a different channel.
From a Home screen, swipe up or down from the center of the display to access the apps screen then navigate: Settings > Connections > Mobile Hotspot and Tethering.
These instructions apply to Standard mode only.
Tap Mobile Hotspot.
Tap the Menu icon (located in the upper-right).
Tap Configure Mobile hotspot.
Tap Show advanced options
Tap the appropriate Broadcast channel:
Tap the Auto then tap an alternate channel (i.e. Auto, 1 - 11).