文件压缩服务器只能压缩一个文件而不重新启动

I've been debugging this for a few days and I can't seem to find what is wrong. This code is for a server that receives UDP packets and then compresses the bytes to create a zip file and an unzipped file. The problem is that it seemingly works for the first file that is sent, but needs to be restarted for any other file. I'm guessing I am closing something wrong, but I can't seem to find it.I've been debugging this for a few days and I c