I am not sure it should come on so soon after heavy rain if the rain sensor is working properly and adjusted properly. My rain sensor, not in-ground, has two adjustments. One is for the number of inches of rain before it shuts the system off. The other is for the length of time to dry out allowing the system to function again. You might check your sensor to see if it is adjustable. (It means climbing a ladder or step ladder).
Last, but not least, I have found rain sensors have a limited working life. You might want to check yours regardless of age. The next time we get a heavy rain check to see if your system will activate. If it does them you will know it needs adjustment or replacement.
Hope this helps.
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