I've been through phases a couple of times where I had to take lessons by myself for a while. One thing that's often a problem for couples who start together is that, in general, beginning follows make progress faster than beginning leads do. It's got to do with the lead having to learn more stuff before they can be a minimally functional dancer. We went through a phase early on where she was getting frustrated because I was not dancing well enough as a lead for it to be a challenge to her. That was one place -- I needed to be able to work directly with an instructor who could help me work through my rough spots without getting frustrated with me. The opposite can happen too. Recently she's been taking some individual coaching in addition to our coaching as a couple. A couple of years ago she had some foot issues for a while, and by her own admission she developed some "lazy" habits regarding movement and expression that have been holding our dancing as a couple back. So now she's doing extra work to fix those.