Sometimes this is time-related. Next time it happens, leave the message open, wait 3 minutes, then attempt to post again. EDIT: it would also help if you posted a screenshot of the error.
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Wonderful, thank you for letting us know Geoffrey. I'm happy we were able to finally resolve this for you. Please don't hesitate to post again in the community if you have any other concerns.
Thanks,
Liz
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In my haste I meant to add that if the server deems the packet wasn't recieved, when in fact it just got the handshake late, it may attempt to resend the packet anyway, resulting in using twice the data.
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