Hi people i have got an ntl 200 cable modem at the moment but as it is forever disconecting

i have decided to try another modem. I have tried to call ntl tech support but the are so stupid as i guess most of you already know. They have told me nothing is wrong. Anyway back to the modem, does anyone know if i could swap my 200 for a 250 straight over without any problems im on the 2mb broadband service. Also would it be possible to get a cable splitter and use the 2 modems together on separate computers as my netowrk hub doesnt want to configure and well to save time and hassel i thought it would be a good idea.