m0useanswered grow question 22 days ago It could be issues from going inside and outside. Grows lights are not the sun and the sun can burn plants that are not used to it.
If its always done this since a seedling it should not have any issues. The heat is an issues of 42c, the medium might bet getting to warm, the leaves taco when its to hot, but I don't see that happening, Can also water with ice cubes and let em melt throughout the day and it will cool the pots at the same time. I've seen this method done for watering orchids in less humid environments as it showery waters them and keeps the roots happy. The cold does not seem to bother them either.
Lastly I would check under the leaves with a magnifying glass and see if there are any mites on the plant.
Good Luck!