I bought this in February.  Lower power levels are not lower in power.  They are just with no microwave energy for longer periods of time.  When there is microwave energy, it is always High power.  Can't even pop corn as it stops popping when no microwave energy on and then burns when the (HIGH) power resumes.  I can cook things quicker on top of stove in order to prevent burning.  Does not distribute heat evenly as quoted in manual while in the no microwave energy phase.  Is not a warranty issue.  It is just the way it is made.