I've wanted to do related things with wifi/bluetooth, just a heads up though that the typical rtl-sdr you find for 20/30$ can't see the 2.4ghz spectrum which both wifi/bluetooth use (typically)
May not need to worry about that, the interference can be in other bands if it's strong enough to blind the other receivers (There's no such thing as a perfect filter). That said I'd expect that it's going to be someone's microwave, or similar device, that's just flooding the spectrum around 2Ghz also.