Troubleshooting bundle submission


I tried to send the bundle couple of days ago via but failed to do so despite of many attempts.

The bundle consisted of 4 transactions with total gas 5254130. The maxPriorityFeePerGas was set to 50 GWEI in every transaction what seemed to be pretty high at that moment. I fetched blocks information from Blocks API and saw that effectiveGasPrice varied from 1 to 53 GWEI. maxPriorityFeePerGas set in bundled transactions was usually smaller then set in my transactions.

The simulation was usually passing just fine. I had some intermittent error results simulating bundle with the error message: {'code': -32000, 'message': 'header not found'} - I’m using Python 3.9 and flashbots ver 1.1.1 package

Could you please help me understand the reason of the bundle not being mined? Is my understanding correct that the the total bundle tip resulting from priority fee being significantly higher than effectiveGasPrice is enough to include my bundle or I am missing something?

I’d really appreciate any guidance in this matter.

Best regards