Poor connection with a 11Mbps connection

Tonight I noticed my doorbell 2 was saying "poor connection" very week. The app shows it at RSSI-45. This has just started, gone months with no issues. It is connected to my google fiber wifi hub which is about 10 feet away. The google fiber page shows a connection speed of 11MBPS wireless to the doorbell. That should be plenty fast so why am I getting a poor connection message? Firmware is up to date on the doorbell. Thanks, john