These details are not transparent to users.
Discussion
It's not a channel reserve issue. Mutiny actually makes it perfectly transparent. I'm trying to send 5k and getting routing errors
In that case, could simply be that particular channel doe not have available routes to the destination? Lack of liquidity somewhere along the path?
This has been due to LSP issues, as indicated by the offline channel, and it should be fixed as of tonight. Let us know if the issue persists.