I have exactly the same issue. In fact, I have also changed the Force Touch just to rule out that in the process of changing the battery it would have been damaged for some reason. It seems it keeps on a continous boot loop, only showing the logo, even though I tried a hard reset with it (with and without the charging stand). It’s also partially connected to the iphone, as I can modify certain parameters as volume o the speed of the speech from there, but not the “find my apple watch” button. Any idea?