Hello! This issue is related to the failed transactions with Solana that others have been experiencing across the space.
We’re working on better retry logic so that it automatically retries failed transactions. You may also see an improved experience by changing the RPC node for the Solana network.
Link to adjusting RPC: https://support.brave.com/hc/en-us/articles/15616019512845-Changing-the-Default-RPC-Node
List of available RPCs: https://solana.com/rpc