Has the channel opening be confirmed? I mean did you verify the transaction in the mempool? It may need 3 or more confirmations.
If yes, you have 3 options:
  • send smaller amounts instead of a big chunk
  • increase fee, as for big amounts there are less routes and routing those is generally more expensive
  • stop giving away your sats to exchanges
The first two bullets make total sense. Not entirely sure about the 3rd bullet though…
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