Yes CVT transmission are finicky. CVT transmission should be flushed every 30 thousand miles. I will recommend on 20k miles. it will provide longer life of the transmission. A lot of Customer never replace CVT fluid. It will give up on low miles. CVT transmission are Running on NS-2 or NS-3 fluid. Very thin fluid that is easily burned by the friction of the belt (chain belt that is moving the pulies inside of the transmission. Check for codes if you have Judder code. you are out of luck. check if you are still under power train warranty. and if you have 3 party warranty you are lucky.