We had 2 of these cabinets installed professionally in our remodeled bathroom 4 years ago.  As everyone here has already mentioned, the cord is defective and the wear and tear from opening the door causes the wires to eventually fail.  My side was the first to go 3 years ago…1 light would flicker and on and off then both, then nothing.  We found a replacement cord but it took 4 months to arrive.  It worked on my cabinet, then this week, my husband’s cabinet began acting up.  We’re going to replace them with another brand.  It’s a shame because it’s really a nice cabinet with plenty of storage, but such a waste of money for a simple fixable defect they knew about.