Earbuds are charged at least 70% but turning off each time I try to connect.

I have had my Tarah earbuds for over a year and in the recent couple months they have not been working as smoothly. I charge them every night and check if they are charging correctly. The battery does not last more than 5 hours max nowadays. At around 60-70% charge they automatically turn off, and I have to keep connecting them. Or recharge entirely to have them connect again. I’m really careful with charging and have even switched out the charging box to make sure it’s working. But my earbuds still keep giving me issues.