I don't know if it's new but I've recently discovered a new option in Google Analytics. You can now download Google Tag Assistant Recording on your browser and will alert you if something wrong is going on. I still have to learn about it but I already have downloaded and it's fantastic!

Here is the link If you want to know more about it:https://plus.google.com/u/0/communities/105448214237192581344

Have a nice day!