Bay laurel

Hi. This is my fourth go at a bay plant. They always do so good for like a year and then they die. This time I'm trying to do everything right. I mixed potting soil with perlite and sand like the internet said. Usually I keep it outside because it's summertime but now it's getting to be about 50 at night here in Maine so I'm bringing in at night. I noticed there's a little bit of orange on the leaves and they seem a little rippled. Also as I brought it in I noticed you can see some of the roots on top of the soil. I thought I had it buried in there pretty good. This plant's been doing great for the last 2 months since I potted it. I just don't want to lose it. Any advice?