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