Hi Annie,
I also don't have these problems you're describing.
I do find that Sphere becomes inaccessible for very short periods on a very regular basis. I can't leave the "who's online" screen up, automatically refreshing, for very long before I get an error message.
Your problem sounds like it might be related cookies, or 'biscuits' as we call them in the UK, which store a record of things like your username, passwords and so on, so that you're recognised on your return.
If you can access a list of your cookies, you'll find the Sphere's cookies under the heading "ablemuse.com". Were you to delete these, the site would 'forget' you completely, and you'll need to log in afresh. Hence why I think your problem might be cookie-related.
Are you having this problem with other sites, or just Eratosphere?
If it's just the Sphere, then I guess (and I am just guessing!) that it's possible that the cookies are corrupted, in which case deleting them might be an idea, since then they'll be created afresh ("rebaked"?) next time you log in. (Speculating even more wildly, maybe your cookies became corrupt because the site keeps going down for very short periods, and did so while your cookies were being updated.)
How do you delete individual cookies? Well google "how to delete individual cookies" along with the name of your browser.
Here's how to do it with Chrome. Find "ablemuse.com" in the list and click on 'delete'. Then log back into the site. Navigate away from it, go back, and see if you've been wholly remembered.
Try to avoid deleting all your cookies, if you do this, everywhere you've ever been will forget all about you and you'll have to log back into everything that needs a login (email, facebook, etc).
Incidentally, here's a top tip: when you're trying to read an article from the New York Times, say, or some other site that says, "you've reached your free article limit for this month", go find its cookie and remove it. Then that site forgets all about you and your free article limit is reset.
best,
Matt