If you dont have a wind cover, just make an impromtu wind cover out of some tin foil. Just poke a few holes with something sharp so you get enough ventilation and you're good to go. If that doesn't alleviate the issue then it could be your pack.
If the foil wind cover works then look into purchasing one, the foil ones I make at home dont last long.
Success usually comes to those who are too busy to be looking for it.
- Henry David Thoreau