Sometimes it does cause instability. But one should always solve it by talking to the other person. He/She might be in stress due to office/family/friends. Talk it out at ease and peace with your partner & it will definitely help you sort out issues with your partner.
It's never just sharing bed/intimacy but it's also a connection one should establish. Sex is not just any activity but it helps you in releasing harmful toxins at the same time and carrying it out with happiness and mutual agreement will lead to a happy life.
Rest you can always discuss this and we will be happy to guide you on this. Because I believe in talking out and finding the best solution via real life examples.