Issues getting MyPhonak app to connect in busy restaurants

Giving this a thread of its own. I often have a problem getting the MyPhonak app to connect with my Phonak Marvel hearing aids in a busy restaurant. The app is helpful in reducing or muting background noise when using the Roger On (which has been of great assistance). I assume it’s a Bluetooth interference issue. Sometimes one HA will connect, sometimes neither of them. Anyone have any solutions to try? Thanks.