This is highly dependable on your WiFi network configuration. Below are common sources of interference:
Crowded WiFi bands where external access points use the same brand as yours.
Other devices e.g. garage door openers or microwave ovens.
Hopping between multiple access points.
Automatic changes of the Wifi band by the access point.
- Bad WiFi connection to your Mobile Phone, therefore package loss
Please try to eliminate those sources.