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Bitcoin keep surprising me . the stupid blockchain wallet . I've playing to discover some mysterious fact it  . I discovred some amazing facts i'll share you 2 Today and the others for the next opportunity
https://ibb.co/vx8jxVS

This error happen in blockchain wallet when u set the fees to the lowest fee possible which is "1" or when u make consecutive transactions in such speed

Even without these technical issues, the blockchain's wallet (or online wallets in general) is not something you should be using. If you're only using the wallet for BTC, I would recommend you switch to Electrum[1] instead.

[1] https://electrum.org/#download

Why are you even still using blockchain wallet in the first place. I just sent a transaction of a fee rate of 1 sat/vbyte through my electrum and it was broadcasted without any challenges.

Try refreshing the app (clear cache and data plus updating it). If it persists contact support.

Not so sure about why it errors when setting to lowest fee but the latter is probably to prevent double spending that trigger them even though the amount might not actually the same as long it covers a short period of time to execute the sending process.

It's because blockchain.com has organically funnels any new users while using google when searching bitcoin wallets. OP might register when he still newbie or still newbie in this space

I suggest to OP that listen to those guys suggesting above. Electrum is way more better to use as a wallet.

There are many people experienced the same thing like this https://bitcointalk.org/index.php?topic=5390322.0

Both of their apps and web wallet are having the same issue.

The only solution for this is to switch to another wallet or Electrum as suggested above you can recover your wallet by importing your wallet into Electrum. You can follow the guide from this post below

- https://bitcointalk.org/index.php?topic=5390322.msg59567033#msg59567033

Not many of the web wallets don't allow the users to select the transaction fee for example coinbase will simply let the users to use the recommended fee but for me that is safer compared to selecting the fee on our own because people who are using online wallets may have lesser knowledge about what will happen if they set too low or high fee.

Anyway you're still using blockchain wallet? Its the wallet with more bugs if I am not wrong so switch to Electrum as omega mentioned to feel what is the experience of using an actual wallet.

Only works if the fee estimation is close to accurate. Blockchain.com has a history of too low/too high recommended fee, I wouldn't trust them. But I'm guessing OP's problem is more than just setting a fee too low for blockchain.com eyes.