I have noticed that sometimes when i wake up my phone, that the screen is VERY dim. i always have my iphone 3gs brightness up to around 75% with auto brightness.. but- sometimes the lockscreen with be dim... even with full battery.. then i will think "thats weird" and turn it off (via the top sleep button) and turn it back on and it will be all the way bright. Is this a new feature? or a fluke? IDK- has anyone experienced this??