Please, elaborate more to know the details. It's impossible trying to help you if we don't know the details. Blank pages can be caused by a lot of things, most of the times due to poorly coded themes/plugins.
Ok. That shouldn't be happening.
First of all, you should check your logs and see what is happening at the moment you receive a blank page.
sudo log domain.com -error
Also, is it also happening with all your plugins disabled?
Did you test it using an standard WP theme like Twenty Nineteen, for instance?
Please, as I said before:
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