reconnect controller

I’ve owned the te round 2, I think (light grey art of all the sf cast, red bezel) for about 4 months. I don’t play much and don’t go hard on the thing. I just got the ‘please reconnect controller’ issue. I tried unplugging but that didn’t work and I don’t think the guide button’s working now.
I didn’t open it up but I think it only has a 90 day warranty. Could I still send it in for repairs or should I just get a new one?