If you have a lambda nodejs skill and you use it to call another api. if your api can get the call sometime, sometime not.
Then, you need to check your lambda log. if lambda log is normal and it shows it made the call.
Then you need to check your code, make sure you finish your intent function by return false. which will give your api callback time to run otherwise it will stop the thread then, your api will not be able to get the call.