So I lost my tomato frog last night. I just need help figuring out what did it because there were no signs whatsoever, the most upsetting thing is having no idea what caused it. Wondered if anyone had any ideas to offer.

He was in a big plastic tub with a nice hole cut in the top for ventilation. His substrate was coco earth, which I always kept moist, the temps were in the mid-upper 70's and I was careful to keep his humidity at or above 70 [may have dropped a few times on accident but never to dangerous levels] I gave him lots of crickets about twice a week, dusted with calcium or vitamins every other feeding, but he was always a sparce eater. He croaked regularly, sometimes when I was maintaining all their tanks and talking to my frogs as usual he would randomly start croaking and making a ruckus. [Lol i'm making myself sad here..... anyway] He was alone, could he have died of loneliness from stress? He didn't seem stressed to me, he was very plump and was a bright, beautiful orange color. He was in great physical condition, I gave him a once-over every time I tidied up his tub, no signs of red leg or anything, just a fat angry frog. Even when he died I didn't realize immediately he was dead, he looked exactly as he always does. In hindsight maybe I should have taken pictures but trust me, I doubted he was even dead at first, he looked excellent.

The only thing I can think of that was out of the ordinary was that my dad was replacing the tiles in the bathroom next to my room, but he didn't use any chemicals that I know of, there was no dust and I kept my door closed, there was just a lot of noise? Could he have inhaled something harmful, or maybe been worried by the noise [which really wasn't even that loud?]