The type of freeze you describe is probably caused by an unexpected error in the client, most likely during rendering of some GUI part.
To be able to fix it, I need to know what went wrong, and where. So, next time it happens, do this:
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Press
Ctrl + Shift + ito open the Developer tools (Chrome/Firefox) -
In the Console tab, find the first error lines (red)
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Expand the error:
-
Copy the error text, or screenshot it, and add it to your bug report in the forum.
For step nr 2, if you’ve typed a poorly formatted command, you might also get errors in the log. These can be ignored.
/Accipiter