This happens to me, too. Going to try the above suggestion next time this occurs, but what I've found that works for me is when this starts happening, I've found that changing my UI (whether through the options window or through the /loadskin command) helps. It's a pain, but I'll select the default UI (/loadskin default) then I'll go back to the Velious UI (/loadskin velious). This fixes it for me. At least for a while
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