The receiver's location is very good and the receiver is getting some overload from a couple of high powered shortwave broadcasters in the 41 meter band (7300-7300 kHz). This will cause distortion across the whole 0-32 MHz spectrum when the signal gets to 60 dB over S9. A 20 dB attenuator has inserted as a brute force workaround. A better solution will be coming soon.
Some experimental code has been added to all four KiwiSDR receivers that should allow for a better experience while using a smartphone. I welcome any feedback on this that you might have.