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If you have not tried accessing the MOD21A1D V006 since the 31st of March, please try again. On that particular day we were down for an extended maintenance period which may have caused that type of glitch.
by exouser » Tue Apr 13, 2021 7:13 am America/New_York
Thanks for the answer. I did observe that it was back a few days after.
I let the question open for any information on cause that could be valuable in the future (which you gave).