Conection issue with bluetooth keyboard A7726


I have been using the A7726 bluetooth keyboard for a while with a MacBook Pro and MacOS 10.15.
I recently updated to MacOS 10.15.3.

I get the following issue: the keyboard get disconnected after only a few seconds idle time (about 5 seconds) instead of 30 minutes as noticed in the user manual.

Is there something I can do?