Is it permissible to repeat a prayer when one feels dissatisfied with it or has been distracted during it, knowing that this happens only a few times?

You must strive to achieve presence of heart and devotion in prayer by warding off the imaginations and whisperings caused by Satan, for the Prophet, peace and blessings be upon him, said: "When the call to prayer is made, Satan flees, passing wind so that he does not hear the adhan. When the call is finished, he returns. Then, when the iqamah for prayer is made, he flees again. When the iqamah is finished, he returns and comes between a person and their soul, saying, 'Remember this, remember that'—things they had not remembered before—until the person does not know how many rak'ahs they have prayed." If you become distracted during prayer, you are not required to repeat it.