That seems like a clear result thus far. So the provisional conclusion presumably is that the ISS is continuing to transmit on schedule despite the low temperatures, but that there's likely some drift in timing or frequency of the packets as the temperature drops, which your original VP2 console struggles to keep synch with.
What I'm not clear about though is whether there's any intrinsic difference between Vue and VP2 console circuitry, which I'd find a little surprising (expecting them to be almost identical); or if it's more a question that ISS and console (of whatever flavour) are never perfectly matched because of component tolerances and that your original VP2 console was simply less exactly matched than the new Vue console. In other words, a new VP2 console might have given an equally good result. No easy way of telling of course, just musing.
It seems others have reported getting better synch with their Vue consoles than the VP, and don't recall anyone reporting the converse. Unless there are some people reporting better with the VP console, it seems that tolerances must be wider on the Vue. If I'm not mistaken, the Vue was designed sometime later than the VP2, and unless they use identical circuit boards in the Vue and VP, then I have to think something must be different.
Assuming Davis is aware of the improved reception of the Vue, they must not have found it cost effective, or thought the problem was widespread enough, to redesign the VP2 circuitry.
Dalecoy asked about firmware; that made me think to look at the firmware updates for the consoles, and it appears that the Vue and VP use different firmware (the latest available for the Vue appears to be 4.18, the latest for the wireless VP2 appears to be 3.15 ), that leads me to believe that they aren't identical, or the firmware wouldn't be different.
Also, I don't remember if there have been many reports in the past, if not then it could indicate that there has been some change to the VP console, such as maybe a bad batch of components from a supplier for the VP boards or something? If I'm reading correctly, it appears the last firmware update for the VP console came out in March 2014, so it it was a firmware issue it seems problems would have started appearing the winter after that, or tolerances change over time, but if I recall correctly the OP had a fairly new VP console which would discount that. But then, I'm also just musing.