I've seem to encountered a bug with fame resetting while unequipping and equipping power armor. This is what happens, with screenshots:
1. I have power armor equipped.
https://s2.file1.info/9WJZA3Ch

2. I'm vilified by NCR.
https://s2.file1.info/RzcPtN2h

3. Unequip power armor
https://s2.file1.info/bW8Lf0Rh

4. Equip power armor again
https://s2.file1.info/mQPovFKh

5. NCR infamy (and Ceasar fame) is gone
https://s2.file1.info/Qyq5ohvh

Now I can walk into Camp McCarren again like nothing happened. Is this a known bug or is there a way to fix this?