40°C and now 30°C??? man it has to be in 20°C-28°C.
its over heating... if thats what you ment, u have to do something to control tha heat...

if its in its 30°C and you cant lower the heat, you can do this, put a bucket of water in there, its not for watering the plants, but itll raice the humidity, this will cool down the plants, even so, you will have to be carefull and do not over water your plants