Is it considered impermissible for a wife to evade her husband if she senses his desire for intimacy, given that there are marital problems between them, and is there any supplication to alleviate or endure these problems?

It is forbidden for a wife to refuse her husband's bed, and the angels curse her until she returns [to him], because it is a grave sin. It is incumbent upon the wife to obey her husband and fulfill his request for intimacy, due to his great right over her. This may also be a means to resolve marital problems. There is no specific supplication for marital problems, but one must turn to Allah in supplication and strive to improve the situation, while also endeavoring to solve problems through dialogue, understanding, forgiveness, and obedience to Allah.