  We present 45 ground-based photometric observations of the K2-22 system
collected between December 2016 and May 2017, which we use to investigate the
evolution of the transit of the disintegrating planet K2-22b. Last observed in
early 2015, in these new observations we recover the transit at multiple epochs
and measure a typical depth of <1.5%. We find that the distribution of our
measured transit depths is comparable to the range of depths measured in
observations from 2014 and 2015. These new observations also support ongoing
variability in the K2-22b transit shape and time, although the overall
shallowness of the transit makes a detailed analysis of these transit
parameters difficult. We find no strong evidence of wavelength-dependent
transit depths for epochs where we have simultaneous coverage at multiple
wavelengths, although our stacked Las Cumbres Observatory data collected over
days-to-months timescales are suggestive of a deeper transit at blue
wavelengths. We encourage continued high-precision photometric and
spectroscopic monitoring of this system in order to further constrain the
evolution timescale and to aid comparative studies with the other few known
disintegrating planets.
