Do not have time to answer in depth, sorry, will try to do so later... hopefully.
couple things here. First do not do any baths unless is needed, that is not the your case. Please post pic of the tank and a frog to get a better idea, but 4 days off food really not something you should worry about. Yet.

Overall it seems to me you have humidity issues that you have to solve. Misting 2-3 times a day may not solve the problem. You need to invest in good gauge, possibly controller and a fogger. That would be the easiest route.

In reality you you might just need to get creative and figure out how to control it all without extra expenses if you can help it. Usually covering 3/4 of screen top helps, people put wet towels on top, things like that. When humidity drops to the point the substrate get dry - that’s your danger zone. That should never happen to a young frog.