Network bandwidth issues usually result in delays while playing. Never heard it cause distortion. Been streaming happily for years now. WiFi can be obstructed by objects in the signal path and of course weak signal can cause issues. Laptop should tell you how strong WiFi signal is at a particular location. Try moving things a bit if possible and see if signal strength changes. In any case never heard of weak WiFi resulting in distortion. Should be all or nothing. Always possible lights, microwave oven, etc impacts WiFi signal but again never experienced distortion as a result.
Make sure source devices are delivering proper line levels. Any volume control on play? Try a different non streaming source device as a test maybe or try a different input on preamp if available.
Make sure source devices are delivering proper line levels. Any volume control on play? Try a different non streaming source device as a test maybe or try a different input on preamp if available.