Kind of happened the same thing with me, since I turned 10 I didn't stutter,olny very rarely. In October 2023 suddenly I started to stutter worse then ever. Since then it has got to be a bit better but it's still a struggle. It's more like speech blocks. I'm trying to over come my stutter with hypnotherapy and somatic therapy if these won't help I'll try other therapies. Since I started to stutter I've got jaw muscle tightness. Probably caused by stress or PTSD.