I have the same oppinion but I'd like other oppinions.
Could this be caused by any environmental condition?
I spent the weekend out of town and forgot the A/C turned on set to 22 ºC (71 F). It has beed cold around here these days so I think these temps are not a problem but humidity falls to somewhere between 20-30%.
Usually I use the A/C at night but turn it off by bed time.
Another possibility is sunburn. With the change in sun position this phal now gets some late afternoon sun for maybe an hour or two. But I have a translucid/ almost transparent curtain in my window.
Does it look like sunburn in the early stages?
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