Has anyone else noticed this?

At home I only have G and when I go to an area where there is a H connection the notification bar still says G for several minutes. I only know that I'm on a H connection because the speed is significantly faster.

The opposite happens when I return home. The bar still shows H for up to 2 hours even though I know there is no H connection and the speed drops noticeably.

It's not a major problem as the connection still works all the time but it is quite confusing when I go to a new area.