Definitely agree with Boring, first thing to do is remove that 1/2 amp adapter from the mix. Output voltage stability is just as critical, and while you may not be exceeding the current draw limitation of your adapter, you may be dropping far enough below the spec'd 5V output enough to create issues.
And to answer your other question, no, you don't need to burn images from the wiki/download pages with the Phoenix utility. I've used win32 disk imager for everything (debian, android, remix) with no issues.
And to answer your other question, no, you don't need to burn images from the wiki/download pages with the Phoenix utility. I've used win32 disk imager for everything (debian, android, remix) with no issues.