Don't know if I'm the only one seeing this, but I get logged out of the site frequently: often after refreshing after having the page open for a while, but sometimes while I'm actively reading through a post. It's happening on multiple PCs, and I'm seeing the same thing on iTunes when trying to check for new podcasts. This has started within the last week, so I'm hard-pressed to figure out what I might have changed on my end that would effect multiple PCs on just this site. If needed I can provide more info on PC specs and browser software.
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