I have a 2015 Mitsubishi lancer sel 2.4l. When I was driving home one day coming to a stop getting off the highway, I started breaking and my transmission started grinding and popping. I thought it was the road at first but when I started going again it was like first gear was completely out. Then once I got going a little further I noticed I didn’t even have second. Once I got up to about 45-50mph it started driving normally but struggles to get going now. Any ideas on what could be the issue or how to fix it?