opensuse 11.2 & huawei E220 usb mobile modem

Hi. I have this weird problem with a Huaweii E220 in opensuse 11.2 . the modem gets connected with modem manager. After 10 seconds it gets connected via network-manager, it disconnects. Then it disappears as an available connection for a minute or so, then I get my configuration available again but no way to connect. Only a few seconds then again stops working. I saw that with older kernels there was a problem with usb but since ununtu 904 it should be solved. I use the latest opensuse. any idea?