Without diagnosing the source it’s hard to be able to answer your question with any level of confidence. I have three iPads in my home, none of which have screen freezing issues. If it’s a hardware problem with your specific iPad then it’s fairly safe to say buying a new iPad will resolve it. If it has something to do with a software or environmental issue, or something with your specific use case, that can be transferred to your new iPad then it’s possible the new iPad will also have a problem.