  We consider the production of two heavy gauge bosons as a relaxation stopping
mechanism. In this work, we analyse the conditions for a tachyonic mode for a
linear combination of gauge bosons and show that the criteria are significantly
different than the single gauge boson case. Moreover, the implementation of the
mechanism on the $U(1)'$ model is demonstrated. We discuss various constraints
for the relaxion mechanism. The phenomenology of the heavy gauge boson is also
explored. We finally show a benchmark point of parameter space considering all
constraints from relaxion and the $U(1)'$ mixing sector.
