Common problem in the cold. It still works with bubbles, but you gotta give it more time to settle.
Yes, but it is only 1/2 year, another 1 1/2. We have Silva compasses that are 15 years old and have traveled with them same places, no bubbles.
I have an extra compass...
Sometimes compasses last years. But sometimes altitude and weather changes kill them quickly. Always have a spare and check before you go to the start that the one you take is working. And get lots of practice navigating in subtle terrain without a compass, so when one does go bad, it's less mentally stressful.