trouble w/ BT Connection, no Garmin Pay Connection and no notifications from WhatsApp.

Since last update of my watch (2 weeks) there is no proper BT Connection with my phone. Although I am able to synchronize the watch, it shows me on the phone "no Connection". So also Garmin Pay does not work, as no Connection to the phone. And last but not least, smart notifications are also not properly working. Looks Garmin has changed the BT Connection in a way, that my phone does not recognize it as a Connection. Using Android, Samsung S9.
So, really bad, I dont like such updates!! Any hints on this?