Families with kids will have their term time routine thrown into chaos as the children are off school for 6-8 weeks at a time. Partners often have different expectations of holiday time. I often hear that mum's need a break from the children and Dad's need a break from work. So arguments arise when nobody wants to do the mundane housework or entertain the kids all day long.
There are all warning signs that you need to STOP and FOCUS on your marriage. It will not fix itself. You need to take time out if you want to avoid things getting worse. If you leave them too long then you will head towards what I call the "switch flicking moment". This is the point of no return when something just changes and you no longer feel that attraction to your partner.