Too much experience for voice activity

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Infrequently, the bot will grant users a significantly large amount of experience for voice activity.

As an example, a user was in voice for ~10 hours, and received over 200k experience. Our experience settings are set to 10 xp per minute in vc, which should have only resulted in ~6k experience.

As a result, users tend to randomly get to the highest rank after only a single or handful of voice sessions. This does not appear to happen with text message activity.