Samsung front load washer UE error model WF42H5000AW/A2

[AWSHandy]

This washer displays this error on the "bedding" setting and sometimes on "delicate".  The floor was uneven, so I balanced it out with the adjustable feat.  It is now level.  That helped a little, but still get the error often enough.  I have new suspension shock absorbers, but not sure this is the problem.  It is a 4 year old machine.  Is there a sensor that needs to be replaced?  This seems to be a common, but tricky issue.  Any help appreciated.