I'm not aware of any specific changes in microwave technology or food packaging that would cause plates to stick in the microwave. It's possible that the plates you are using have a different surface texture or coating that makes them more prone to sticking. Additionally, certain types of food, especially those with high sugar or fat content, can become sticky and cause plates to stick in the microwave. It's always a good idea to use microwave-safe plates and containers and to clean them thoroughly after each use to prevent any residue from building up and causing sticking. If you are experiencing consistent sticking issues, you may want to consider using different plates or contacting the manufacturer for further guidance.