Auto detect for activities

So I went on 2 walks, like 30-40 mins each, and it didn’t detect either. This morning I did some heavy weightlifting, like 1h30min, and it didn’t detect it either. At some point it said that the band detected some high HR and it’s analyzing it, but there is no activity on the dashboard. Has this happened to anyone else? Quite disappointed after waiting for so long on this 4.0