Ganeshi Spore

Hello ! I have been experiencing some issues using the version Second Life 2.6.2 (225998) Apr 7 2011 21:55:52 (Second Life Release) These issues happens after sometime logged in. My avatar not respond to keyboards commands forward, backward - but the viewer does not crash. I can rotate my avatar in that situation and the menu works, but any kind of HUD or chat command does not respond, following the forced disconnection from Second Life. The second issue is very similar: My avatar starts to walk and don´t stop (rubber effect). The viewer does not crash and I can rotate the avatar, the menus works too and following I have the forced disconnection again. My internet connection has 2mb of bandwidth and everything works when I used the viewer 1.23. So I ask: The new version requires more bandwidth? Is there some adjustment in the viewer configurations to solve this issue? Thank you