It could also be the result of temperature variation - the temperatures through glass have been very varied here in the UK with warm cloudy weeks followed by bright high temp days and cool cloudless nights - quite a few old leaves on my phals have wrinkled and gone yellow and their roots are fine. If your plants are near glass try providing shade at midday and a good current of air to prevent heat build up - my unshaded greenhouse got up to over 100deg F the other day.
The amount of water droplets condensing on the surface of your pot indicate to me that there has been plenty of warmth drawing the water out of the potting medium and onto the pot.
Regards
Heather
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