On my Samsung Galaxy S9, my Messenger (Facebook) app has started to act out on me since at least the last month.
When I get sent a message and open up Messenger it works just fine, but when someone sends me an image, Messenger just displays "Laddar ned foto" meaning "Downloading picture".
If I then checks back after a while it has downloaded the images and everything look just as it should.
It feels like an energy saving standby thing or similar.
I use Wifi connected to a broadband fiber, so bandwidth isn't an issue.
It's really annoying and also frustrating to have to wait a couple of minutes or so to find out what has been sent.