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It might help to specify at what point it freezes, I use Android phones and tablets windows XP, Win7, Win8.1 PCs and laptops with chrome and or I.E. 8 to11 without too many issues.
Taking a long time to write a post often ends up with someone "hanging" best to copy the text before posting then if it does hang you can restart the site log back in and paste it into a new message.
Thanks Chris