  It has been recently suggested that oscillons produced in the early universe
from certain asymmetric potentials continue to emit gravitational waves for a
number of $e$-folds of expansion after their formation, leading to potentially
detectable gravitational wave signals. We revisit this claim by conducting a
convergence study using graphics processing unit (GPU)-accelerated lattice
simulations and show that numerical errors accumulated with time are
significant in low-resolution scenarios, or in scenarios where the run-time
causes the resolution to drop below the relevant scales in the problem. Our
study determines that the dominant, growing high frequency peak of the
gravitational wave signals in the fiducial "hill-top model" in
[arXiv:1607.01314] is a numerical artifact. This finding prompts the need for a
more careful analysis of the numerical validity of other similar results
related to gravitational waves from oscillon dynamics.
