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Low frequency may be the one of the possible reasons.
Not a nova but low frequency variations probably due to starspots
The overall pattern seems to be that of a binary system experiencing a #nova?? like event.
Under "view star" although the period is roughly conserved the signal and pattern decay markedly in quarters 2.1 through 2.3.
these give estimates of a system full rotation #period of 15.5 and 16 days.
Apparent deep eclipses are at days 12, 28 with alternate shallow eclipses at days 17, 32.5.
A #sinusoidal pattern of alternate #eclipses depths and peak heights that may indicate a unstable #binary.
possible #transit at 4.0