Lomb-Scargle power spectra of the clear filter photometric observations. The observations were divided into three groups, the combined observations obtained in 2020 November (top panel), those obtained in 2021 January (middle panel) and those obtained in 2021 February (bottom panel). In each panel, the spin frequency of the WD is indicated by the dashed line labelled ω, and show that some power is seen in each grouping at ω. It is evident from these three groupings that there is significant change in the power spectrum on short (weeks, or shorter) timescales, which could be interpreted as showing evidence of QPOs.