No problems here before or after the upgrade. The sensor does seem more sensitive with 4.1 and engages the screen lock when something is about one inch from the ear piece. Before it was about 1/2 inch. The unlock delay also seems to be a bit longer.
It seems that the people who are having trouble, are generally seeing it consistently over multiple phones, whereas the people w/o issues don't see it on any iPhones. This tells me that there is something in the way it is being used that differs. It could be anything from long hair, to hand placement, to environmental lighting.
In any case it's not the users fault, but as much detail about how and where you use the phone (any if other people have the same problem with your phone) would help determine the weakness.
It seems that the people who are having trouble, are generally seeing it consistently over multiple phones, whereas the people w/o issues don't see it on any iPhones. This tells me that there is something in the way it is being used that differs. It could be anything from long hair, to hand placement, to environmental lighting.
In any case it's not the users fault, but as much detail about how and where you use the phone (any if other people have the same problem with your phone) would help determine the weakness.