I recently submitted my first paper to a well-known journal in the field. After about 1.5 months, the first decision was a major revision which I completed promptly and re-submitted (the decision was by a single reviewer, and of course, the editor).
After about another month the same reviewer asked for a moderate revision (also commenting that the main issue of the major revision had been satisfactorily cleared). I again acted on it quickly and re-submitted.
This new version was sent back to the same reviewer again, who, after two days, remarked to the assistant editor that they might want to get a second opinion and so the AE is looking for another reviewer.
Since it is my first attempt at publication, I'm not sure if I should be worried about it being a sign of the original reviewer realizing the work is unsuitable for the journal and wishing to get another opinion for that reason, or if there's still a good chance of eventual publication. Any similar experiences or opinions on this matter would help.