I'm glad that you had said "bad communication" rather than a bad relationship. That is one of the skills that can help couples through a rough patch, identifying specific struggles rather than identifying something larger (and more ambiguous) as a problem. What you are talking about is not uncommon, can often times happen after someone changes the daily schedule due to work ect, and can be a challenge to work through. SOme research shows that couples spend about 15-30 minutes total talking to their partners with any depth, which isn't a heck of a lot.
What you can do:
1)Build your love maps - When things get busy couples lose touch with what's going on in their partner's daily life. By building a weekly ritual where you each ask each other a set of questions about friends, family, work, relationships, dreams, struggles, feeling of support you are able to step closer to the heart of your partner, and feel less alone when schedules don't allow for the same level of conversation. Love Maps
2)Chose a day per week to have a date, be it coffee/dinner/movie night ect. It's important to maintain as many of the rituals you can that were present, before marriage/children/job ect...whatever it was that is filling your days and limiting your contact with each other. When the communication was there, what were you doing together...do more of that.
3)If your partner works more, and you are home more, if possible take care of household tasks in order to help your partner come home, relax faster, and be able to think about you rather than the dishes/laundry ect.
These are just some ideas that are rooted in some of the research on communication. It sounds as though, based on the limited info given, that you have a fun relationship and this distance is less about verbal conflict than it is about time management. If, however, communication breakdown is there, seeking professional support is always advised. If there is criticism, contempt/disrespectful statements, tuning out, or defensiveness often...those are what can corrode relationships. Communication