  Symbiotic binary AG~Draconis (AG~Dra) has an well-established outburst
behavior based on an extensive observational history. Usually, the system
undergoes a 9--15~yr period of quiescence with a constant average energy
emitted, during which the system's orbital period of $\sim$550~d can be seen at
shorter wavelengths (particularly in the U-band) as well as a shorter period of
$\sim$355~d thought to be due to pulsations of the cool component. After a
quiescent period, the marker of an active period is usually a major (cool)
outburst of up to $\textrm{V}=8.4$~mag, followed by a series of minor (hot)
outbursts repeating at a period of approximately 1~yr. However, in 2016 April
after a 9-year period of quiescence AG~Dra exhibited unusual behavior: it began
an active phase with a minor outburst followed by two more minor outbursts
repeating at an interval of $\sim$1~yr. We present R-band observations of
AG~Dra's 2018 April minor outburst and an analysis of the outburst mechanism
and reports on the system's activity levels following the time of its next
expected outburst. By considering the brightening and cooling times, the scale
of the outburst, and its temperature evolution we have determined that this
outburst was of disk instability nature.
