How to automatically reset the NRF24L01 module
This is a known problem with those chips (especially Chinese clones). It is caused when a chip gets stuck in TX mode waiting for an ACK that never arrives back.

The chips don't have a "reset", but switching them into low power mode and then back on again, which doesn't affect any register settings, aborts the current TX operation.

RF24Network is merely a protocol layer on top of the RF24 library. That RF24 library has powerDown() and powerUp() methods. Simply call powerDown followed by powerUp on your RF24 driver object.