Replying to App stability

NS App, iPhone 6, iOS 12.4.2

For over a year the app has had crazy stability issues for me, the screen just freezes and is unresponsive to touch randomly. Seems to be associated with loading data perhaps, it freezes a lot when I am scrolling down fast/far on the main page, an article/video/photo, in threads, and also sometimes while I am watching a video (the video continues to play and load just fine, but the app is not responsive to any touch). Have to kill the app process and open it fresh again to make the issue go away. Happens about 2-15 minutes into a session of using the NS app.