  We study the monopole (breathing) mode of a finite temperature Bose-Einstein
condensate in an isotropic harmonic trap recently developed by Lobser et al.
[Nat.~Phys., \textbf{11}, 1009 (2015)]. We observe a nonexponential collapse of
the amplitude of the condensate oscillation followed by a partial revival. This
behavior is identified as being due to beating between two eigenmodes of the
system, corresponding to in-phase and out-of-phase oscillations of the
condensed and noncondensed fractions of the gas. We perform finite temperature
simulations of the system dynamics using the Zaremba-Nikuni-Griffin methodology
[J.~Low Temp.~Phys., \textbf{116}, 277 (1999)], and find good agreement with
the data, thus confirming the two mode description.
