  Protoplanetary disks emit radiation across a broad range of wavelengths,
requiring a multiwavelength approach to fully understand their physical
mechanisms and how they form planets. Observations at sub-millimeter to
centimeter wavelengths can provide insights into the thermal emission from
dust, free-free emission from ionized gas, and possible gyro-synchrotron
emission from the stellar magnetosphere. This work is focused on CX Tau, a
${\sim}0.4\,M_\odot$ star with an extended gas emission and a compact and
apparently structureless dust disk, with an average millimeter flux when
compared to Class II sources in Taurus. We present observations from the Karl
G. Jansky Very Large Array (VLA) across four bands (between 9.0 mm and 6.0 cm)
and combine them with archival data from the Atacama Large
Millimeter/submillimeter Array (ALMA), the Submillimeter Array (SMA) and the
Plateau de Bure Interferometer (PdBI). This multiwavelength approach allows us
to separate the dust continuum from other emissions. After isolating the dust
thermal emission, we derived an upper limit of the dust disk extent at 1.3 cm
which is consistent with theoretical predictions of a radial drift-dominated
disk. Centimeter data show a peculiar behavior: deep observations at 6.0 cm did
not detect the source, while at 1.3 cm the flux density is anomalously higher
than adjacent bands. Intraband spectral indices suggest a dominant contribution
from free-free emission, whereas gyro-synchrotron emission is excluded. To
explain these observations, we propose a strong variability among the free-free
emission with timescales shorter than a month. Another possible interpretation
is the presence of anomalous microwave emission from spinning dust grains.
