I have a strange phenomenon with one contact (might be with others too, but this one is my best friend, who I write with daily, so I noticed it): Usually the "last seen" was always correctly updated, but for a couple of days it didn't update as it should. Sometimes it just doesn't update for some hours, then it does, and twice it happened to me that I was actively writing with her and instead of "online" the last seen showed a time a couple of hours back.

Not exactly a big problem, but I thought it worth mentioning.

(Or is that connected to the broken status request thingy? But it does work sometimes, i.e. usually when I write with her she is correctly marked as "online")