ReSound's Watch app drops connection to their iPhone app

I have successfully used ReSound's Smart for about a year to control my Linx2 hearing aids with my iPhone and Apple Watch. However, recently the Watch app drops the connection to the iPhone app. The hearing aids continue to work well with the iPhone app, but they do not respond to the watch app. Is anyone else having this problem? I have reinstalled the apps and restarted the on both devices. If ! restart the watch, the app will connect, but the connection is soon dropped. I don't know if the problem related to the recent IOS upgrade or something else. Any thoughts about how to solve this problem will be appreciated. Thanks in advance!