  Non-perturbative quantum gravity effects might allow a black-to-white hole
transition. We revisit this increasingly popular hypothesis by taking into
account the fundamentally random nature of the bouncing time. We show that if
the primordial mass spectrum of black holes is highly peaked, the expected
signal can in fact match the wavelength of the observed fast radio bursts. On
the other hand, if the primordial mass spectrum is wide and smooth, clear
predictions are suggested and the sensitivity to the shape of the spectrum is
studied.
