My devices are all set to clear the cache, browsing history and cookies every time I log off, and I never have any problems with Q's site - or any other come to that. With a site that's changed and updated daily like that one if the cache, particularly, isn't cleared it's bound to cause problems. Every time you log on it'll be trying to build each page with out of date files and won't be able to do it.
Every time people complain on the FB page, nine times out of ten they're fine when they clear their device down. I was in and out of Q's site all day yesterday and it was fine for me.