I concur with the general consensus - sunburn. The seasonal shift in sun can totally surprise you - and the plant... a sudden blast of light and heat, rather than gentle increase. For toasting leaves, the most dangerous time at my house is right around the vernal equinox in March when the sun suddenly clears the house or trees. Second most dangerous for me is the fall where again sudden sun shifts, accompanied by the seasonal hot, dry conditions, also can cause burns. For those growing behind a window, it may be summer instead but the common thread is rapid change. Vigilance is vital...also taking notes (and putting them on the calendar) can be useful, because the pattern is likely to repeat next year.
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