  We present a study of the active asteroid (3200) Phaethon in the 2016
apparition using the STEREO spacecraft and compare the results with data from
the previous two perihelia in 2009 and 2012. Once again, Phaethon brightened by
$\sim$2 mag soon after its perihelion passage, contradicting expectations from
the phase function of a macroscopic monolithic body. Subsequently, a short
antisolar tail of $\sim$0{\deg}.1 in length was formed within $\sim$1 day and
quickly disappeared. No trail was seen. Our syndyne-synchrone analysis
indicates that the tail was comprised of submicron to micron particles and can
be approximated by a synchrone coinciding with the outburst. We estimate that
the outburst has released a mass of $\sim$10$^{4}$--10$^{5}$ kg, comparable to
the two mass ejections in 2009 and 2012, and that the average mass-loss rate is
$\sim$0.1--1 kg s$^{-1}$. The forward-scattering effect hinted at low level
activity of Phaethon prior to the outburst, which increased the effective cross
section by merely $\lesssim$1 km$^2$. Without the forward-scattering
enhancement, detecting such activity at side-scattering phase angles is very
difficult. The forward-scattering effect also reinforces that the ejected dust
grains rather than gas emissions were responsible for the activity of Phaethon.
Despite Phaethon's reactivation, it is highly unlikely that the Geminid
meteoroid stream can be sustained by similar perihelion mass-loss events.
