My wife and I both quit our jobs before we left to travel. We've been together for 13 years at this point, were at about 10 years when we started traveling. Something about the travel just resulted in us bickering way more than we ever have before. We aren't 100% sure what the cause was.

I think traveling even slower 1-2 weeks/city might have helped with this, but then again, some cities just don't warrant that much time.

Since coming home we've since traveled for a 5 week trip together and it was much smoother. Perhaps we just needed to learn how to travel together.