  We report photometric observations of GQ Mus performed between 1992 and 2011.
We find that the total amplitude of the orbital modulation of its brightness
decreased from ~0.9 mag in 1992 to ~0.2 mag in 2010, becoming comparable to the
amplitude of chaotic flickering on a time scale of several minutes. Optical
spectra obtained in 2001 and 2012 indicate continuing activity of GQ Mus. The
spectra show broad emission lines of HeII and HI typical for magnetic
cataclysmic variables. The nova was observed as an UV-bright object in 2001 and
2012. We also show that the orbital period of GQ Mus has been constant between
1989 and 2010-2011.
