I bought this product in July, and the first problem started just 2 weeks later. We hear a loud rattling noise during microwave use. 

The second problem I've seen is an error that pops up infrequently saying 'F3 - Key Pad Short' - sounds like an electrical short.

When it doesn't have issues, it is quiet, great looking, and cooks beautifully. Disappointing quality control at this price point.