If it re-occurs.... I would check to see if the space between the magnet and the reed switch has widened... due to temperature change.
Very good point
Dave. That could be a cause for the door which the LED sometimes stays red.
For the window, it sounds like a signal reception issue because it will flash the LED if there is no signal received within 4 hours.
Do you really think that the cold air is affecting the base.
When you said it works fine during the summer and acts up during the winter, I'm thinking that during the summer it is just barely working and during winter either the cold or even the extra heat being turned on inside is creating just enough characteristic change to cause it to not work.
So I don't believe that the season is the root cause here, I think you have a weak signal from these 2 zones as far as the console is concerned.
There is nothing directly in front of the console.
If you stand at the console and look in the direction of these 2 problem sensors, and if you could see through walls, would a stove, refrigerator, tv, or other large object obstruct your view of seeing the DS10As?
The wires from the DS10A's base and it's magnetic switch can be easily extended. You might want to try extending the wires on these 2 and try some different locations. If you have already changed these 2 sensors with others, then the problem has to be the signal not reliably getting to the main console.