A sudden change in light intensity has detrimental effects in many cases. It changes not only light levels but also temperature and water use. So that could be the cause. However based on the symptoms you might also consider soggy wet soil conditions or some type of root rot. Your County Extension Office can assist you with diagnosing root rot on plants. Call them to see if you need to bring a sample in or just send it to the state lab and to find out any charges or paperwork that might be required.
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