Disturbance in married life may occur due to many reason  and may be further detail discussed based on combination.  In general Affliction of Venus in male and Mars in female horoscope If Venus or Mars are deeply afflicted  by malefic or in enemies in rashi or combustby rays of sun If they are debilitated in navamsha and in infancy or mrtuyavastha If they are with rahu or satrun 7^th house malefic 7^th lord with malefic and venus/mars debilitated Venus moon conjunction and mars moon conjunction aspected by rahu. Transist satrun in 7^th house and rahu afflicts 7^th lord.