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This happened to me too, along with a few others. I'd say to ask this kind of question in the technical support thread, but I don't think there's really a complex answer. For now, use a different alt and wait until the next server restart.
Edit: [01:16:37] Alter: Hi guys. If you're experiencing a problem where you can't speak because 'you're typing too quickly' or you're automatically getting locked, then don't worry. The issue is being worked on right now. Have a nice day!