Peter, sorry to hear you're having troubles with your camera
Another thing you could do, which isnt the best to do, but might help with the issue is to bump up your ISO This will give you faster shutter speeds which will usually give you better, sharper images. Not always a given, but it can help.
As the others have said, use your tripod, use either the self timer or a cable shutter release and the mirror lock-up and if you're still getting blurry images, then I'd send the camera and lens in to be calibrated.
And make sure you recycle that Rotella plastic bottle you found in the yard