I recently had to bite the bullet and clear the entire cache for my Chrome browser (took forever, I must have had a ton of cookies!). Repeated attempts to clear the site data for churchofjesuschrist.org was unsuccessful for me, and I always had to access LCRF via a private browsing session. It was probably user-error, but somehow I wasn't able to clear the data causing LCRF to be inaccessible, until I did a full clean cycle. It's been working well since, knock on wood
Just another data point, in case there's others who find similar behavior where clearing site cache doesn't seem to resolve the problem, a full wipe of browsing data may be needed.