This happen to me recently after a rebuilt engine was re-installed. Maybe they didn't bleed it correctly, I don't know. But it dumped a lot of water on the ground, and the inside of the tray was wet.
I lifted the plastic plate in the tray and found that the handle on the bleeder valve was up (i.e. open).
I closed the bleeder valve, refilled the reservoir, and it's been fine since, including 4 hours on the track in 90 degrees.
I don't know if the open valve was a symptom or the cause, but you might want to check it.
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