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Can you tell us where to find those reports? Remember that Android usually doesn't do true multitasking--apps are typically paused in the background when you switch to a different app. If the app you switch to requires a lot of RAM, then the first app you were using might have to be closed out of RAM first. So when you go to open that first app again, it has to open in RAM from scratch.
How do you know its just some Moto G 2014 phones? Anytime I ask someone (globally) the answer is usually its a problem. So it seems its all devices. Unless someone here who uses the phone daily can confirm otherwise. And why isn't Moto saying anything other than we know there is some kind of issue....given the holiday buying season its in their best interest to prioritize this as it was this model runaway sales that saved the company.
Does the problem stay when on a different launcher like Nova?
From an AOSP M8
The Moto G 2014 forum here has over a hundred threads and this is the first time I've seen this problem reported.