My prompts are pretty complex as you can see here: API Prompt for gpt-3.5-turbo-16k - #12 by SomebodySysop
I haven’t tried the new gpt-4-turbo-preview but I’ve not had problems with these prompts with gpt-4-1106-preview. Although with gpt-3.5-turbo-16k I had your exact problem. I didn’t totally fix it, but improved the responses by sending the prompts in XML format. Maybe try that with your prompts to the new turbo preview to see if it makes a difference?