Switching career is a sign of passion. Some people are good at it and some are not. If you have the ability to change career quickly then it's good thing for your resume. But if you change career too frequently then it might put a negative impact on your resume. You are better off sticking to one career.
Yes, It can be. If you are switching jobs too frequently on the same designation without any improvement, it can have a negative impact on your resume.
It can, depending on how you present it. If you make it look like you're constantly chasing the next big thing, it can be a turn off for employers. However, if you position yourself as someone who is always looking for new challenges and willing to learn new things, it can actually be seen as a positive.