yes if the Pub you connected to is down it'll show an error connecting toast

Can you send a screenshot of the LNURL one if you get it again? The chain one might be transient, the Pub should give you a chain address... will take a look.

Channel management is in the pub dashboard, if you're connected as admin there's a dashboard link in the nav or you can tripple click the shock logo... dashboard is pretty bare bones but there's basic channel management. There's no chain-out yet, we're going to hook up swaps for that.

Can you send a screenshot and the OS/model version?

Is there a note on the send screen indicating the reserve? There should be and usually is but you're not the first to mention it so I'm wondering if it's not showing up in all circumstances.