hi all since i have got my speed increase to 4mb from 2mb my upload has been really bad,

wot i mean is it would upload all day long with the upload of 22k and it would sit @ this speed all day now that im on 4 meg it wont stay constaint 45 its all over the place

then it would sometimes cut out then reconnect again im not happy about this at all my modem is the terayon tj 210
please can someone who has had the same prob and got it fixed tell me who to do so.
regards scumacher.
do you think that ill need a new modem?