Snake starts to come up after hours of printing

Hello! I bought a flexy factory snake digital copy to make for my son for his birthday and also to hand out as party favors. I am not sure what I am doing wrong. I have tried a textured plate a smooth plate and the same thing happens where a little over 2 hours in, pieces of the snake start to move and come up. I was able to glue a piece down for one snake and it worked but it has not worked again. I make sure every time I make a print I wash my plates and one time I put glue all over the plate before printing and it still came up in parts. I am not sure what to do or what is going on. I do have an enclosed 3D printer, I don't know if that makes a difference or not. I tried different filaments to see if that work as well, it still came up! I looked it up and it said make sure the plate is clean, which it is. I have had to stop it on 3 different snakes and completely get rid of them. It is not like it is happening at the beginning but it is when they have been printing for a long time. I gave up on the snake and printed a dragon about the same size as the snake and the dragon printed just fine. I also printrr a couple more thighs and had no issue. Do you think I should add supports for the snake? It says on the thing it does not need them but maybe it does 🤷If anyone has any idea please let me know! I don't think I am going to get them done before his Bday, each snake takes about 7 hours. This is one of the only things he picked out that he wanted😔 it is also frustrating since I bought the copy.