The RWS-371 RF modules work as at the 434 MHz band, the documentations states: "These modules are indiscriminate and will receive a fair amount of noise".I guess they at least have some kind of bandpass filter, so what does 'indiscriminate' means? How does this compares with the RF24L01 were you need to specify and pipe address?.
In more 'radio' terms, that means they lack selectivity.
An indiscriminate, unselective radio will often stop working if there is a strong signal present outside its bandwidth. This is known as 'blocking'. With mobile comms masts all over the place, you can find strong interfering signals everywhere.