It might help to keep your communications on a predictable schedule as much as is practicable. That can help your partner know to be emotionally "on" at certain times, and in turn they can comfortably turn emotionally "off" to recharge at other times.

For more difficult or complex issues, it's a good idea to ask first if they are fine with talking about it right now, or if there is a better time within the next few days.

Another issue that often seems to come up is when someone asks me a question. Often I feel like I have answered it to the best of my ability, but it seems like the other person thinks I've dodged the question or haven't tried. So sometimes the backing away on my part can be a result of frustration because of the circular conversations that tend to result from the misunderstanding on both sides.

So if you get a very odd or unexpected answer to your question, it might be a good idea to break it down so your partner can understand you more clearly, rather than just repeat it over and over expecting a different answer (not saying you do this at all, but it's a common response to my inability to understand people at times).