Hi BB, sorry to take so long returning to this post.
I have Firefox, which is set to clear cookies as soon as I drop the last window when I shut down. It IS acting kind of weird for the last few updates of the browser, but I'm not sure if that's the problem or my connection.
I really don't have the same problem with other online stores as I do with BB.com. However, some of the other sites I visit online that I use passwords for often log me out for no apparent reason, but at least one I know of is supposed to do that.
The store used to work better for me and I could just pop items into my cart and checkout, no problem. I'm thinking I first noticed difficulties maybe back when we went around with the shipping address going wonky. Remember when I couldn't get the store to accept the P.O. Box? Or could it just have been since the updates have been going on the past few months? Was anything in particular different at the store since you began those?
Doesn't stop me from shopping with you, mind...but I'll put a pot of tea on while I do.

I'm very persistent (read stubborn...lol) so I don't give up if it doesn't go through the first time.