The “App” is actually functions as a website that only you and I share.
Having too many “tabs” (or other websites open) on Safari can definitely slow things down or freeze.
Try closing some of the tabs that you have open, so that your phone have to work as hard.
You can close any of the previous tabs from me, don’t worry, you won’t mess anything up.
Here is a tutorial that I found on how to close open tabs/websites on your phone: