Hi my smartdrive machine keeps going off balance

sure- hopefully you have a bit of room to move your appliance a bit. lay down on the floor, if able. use a flashlight. you should see 4 nylon or metal feet that the washer sits on. they'll have threaded bolts that lead into the bottom 4 corners of the washer. don't know how old your machine is, but if things look rusty, a little wd40 sprayed on them will help!
have someone help you lift the end of the washer opposite the way the axis of the drum is tilted. jiggle the drum a little and observe whether it becomes more centered. if you can, stick a piece of 2x4 , or 2x2 under that edge and turn the pads in a 'lefty-loosey' direction. this will raise one edge. take out the wood or spacer, and check the centering. you may need to mess with all 4 'feet', to get it right.
make sure your floor/platform the washer is on is solid!! if it's rotting out, check that your water connections are not leaking, and your drain hose is properly seated! good luck.

sounds like your "bias spring" has broken or fell off. This is located at about the 7:00 position under the top and attaches the tub to the drum supports and keeps the tub aligned. It is possible that you have a bad tub support as well, but less likely.