I have not tried with a comma at the end, I'll give that a try, but why would that fix it?
its just a guess, but it might be, that the castrandom only functions correctly, if there is an action that can be executed and 'hangs' or reacts 'funky' if at any time all possible actions are on cooldown. With adding a comma you add a 'nothing-command' at the end, which always will be executed.
..i came to this idea, because for me:
/castrandom Multishot
/castsequence .....
wasnt working and
/castrandom Multishot
,
/castsequence .....
was.
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