Humidity or lack of oxygen is what im think has caused the problem. Today is the hottest day of the year and record temps for november ....climate change much. 110f / 40degree C , internally the cabinet is 31c which I think is alright - not ideal.
I had the intake fan on the bottom on the cabinet sucking cooler air from under the house , with a opening at the top for the air to vent out. I changed this today so i have the at the top sucking the air out while (passively?) drawing the air in. I think temps are lower so maybe this is working better.
A couple of times ive noticed moisture on some leaves from humidity even with the fan sucking in alot of cooler air so maybe this will solve that problem and i'll have more luck next time.