Preto, like a lot of tougher varieties to root have a stalling period. I also had one I rooted from tyro and right around this time, it stalled on me and didn't start growing again until late summer. I thought it had died on me a few times. So, if the stem where the leaves were are green and healthy, keep it barely watered for the roots. And if you are able, take it outside, above 60/70, and bring it inside if it's lower than 60 or so. Good luck, hope this helps.