Mate, if you don't know the solenoids are rooted, don't change them. If you didn't flush out all the old fluid the first time you just have slightly diluted dirty fluid in there. The solenoids may just be sticking because they are full of shit. Remember low fluid levels cause heat and wear, Too high levels cause foaming, cavitation and wear. If you are not sure of what you are doing get an auto place to flush and change the filter.