The other question "rabbi-shopping" asks about asking a single question to two Rabbis.
This question addresses the possibility of changing the personal ruling Rabbi time to time. Assuming a person wholeheartedly and exclusively follows his current Rabbis rulings:
- How often can one change his Rabbi?
- What are the reasons a person can turn from his current Rabbi to another?
- Are there differences between different communities (Litvakes, Hassidish, Sefardish)?