Is it common for a stutter to go away and come back years later?

Is it common for a stutter to go away and come back years later? Hello. I am 17 and I’ve got a stutter. I had a mild stutter when I was a young child according to my mum and it was more obvious when I was anxious. It went away on its own but when I was 14 it came back and again it was more obvious when I was anxious and it was mild. Now I’m 17 and a few weeks ago it came back but now it’s more severe and happens a lot including times where I’m not anxious. I’m being tested for FND (functional neurological disorder) for unrelated reasons and I don’t know if that’s the cause of my stutter or if it’s something else. I don’t know if my stutter is the same one from when I was a young child or if it’s a new one from my (possible) functional neurological disorder. Im also autistic and I don’t know if that has anything to do with it but I thought I should say it just in case. I was wondering if it’s common for stutters to go away and then come back years later so if anyone knows please let me know. Thanks for reading and I hope you have a lovely day