diff --git a/client/src/thin_client.rs b/client/src/thin_client.rs
index e5b70b3d8e..2eb0aded17 100644
--- a/client/src/thin_client.rs
+++ b/client/src/thin_client.rs
@@ -16,7 +16,7 @@ use solana_sdk::packet::PACKET_DATA_SIZE;
 use solana_sdk::pubkey::Pubkey;
 use solana_sdk::signature::{Keypair, KeypairUtil, Signature};
 use solana_sdk::system_instruction;
-use solana_sdk::timing::duration_as_ms;
+use solana_sdk::timing::{duration_as_ms, MAX_PROCESSING_AGE};
 use solana_sdk::transaction::{self, Transaction};
 use solana_sdk::transport::Result as TransportResult;
 use std::io;
@@ -206,17 +206,24 @@ impl ThinClient {
         min_confirmed_blocks: usize,
     ) -> io::Result<Signature> {
         for x in 0..tries {
+            let now = Instant::now();
             let mut buf = vec![0; serialized_size(&transaction).unwrap() as usize];
             let mut wr = std::io::Cursor::new(&mut buf[..]);
             serialize_into(&mut wr, &transaction)
                 .expect("serialize Transaction in pub fn transfer_signed");
-            self.transactions_socket
-                .send_to(&buf[..], &self.transactions_addr())?;
-            if self
-                .poll_for_signature_confirmation(&transaction.signatures[0], min_confirmed_blocks)
-                .is_ok()
-            {
-                return Ok(transaction.signatures[0]);
+            // resend the same transaction until the transaction has no chance of succeeding
+            while now.elapsed().as_secs() < MAX_PROCESSING_AGE as u64 {
+                self.transactions_socket
+                    .send_to(&buf[..], &self.transactions_addr())?;
+                if self
+                    .poll_for_signature_confirmation(
+                        &transaction.signatures[0],
+                        min_confirmed_blocks,
+                    )
+                    .is_ok()
+                {
+                    return Ok(transaction.signatures[0]);
+                }
             }
             info!(
                 "{} tries failed transfer to {}",
diff --git a/core/src/banking_stage.rs b/core/src/banking_stage.rs
index 0c08fcc6ed..d59455a5bf 100644
--- a/core/src/banking_stage.rs
+++ b/core/src/banking_stage.rs
@@ -22,8 +22,8 @@ use solana_runtime::locked_accounts_results::LockedAccountsResults;
 use solana_sdk::poh_config::PohConfig;
 use solana_sdk::pubkey::Pubkey;
 use solana_sdk::timing::{
-    self, duration_as_us, DEFAULT_NUM_TICKS_PER_SECOND, DEFAULT_TICKS_PER_SLOT,
-    MAX_RECENT_BLOCKHASHES, MAX_TRANSACTION_FORWARDING_DELAY,
+    self, duration_as_us, DEFAULT_NUM_TICKS_PER_SECOND, DEFAULT_TICKS_PER_SLOT, MAX_PROCESSING_AGE,
+    MAX_TRANSACTION_FORWARDING_DELAY,
 };
 use solana_sdk::transaction::{self, Transaction, TransactionError};
 use std::net::UdpSocket;
@@ -423,7 +423,7 @@ impl BankingStage {
         // TODO: Banking stage threads should be prioritized to complete faster then this queue
         // expires.
         let (loaded_accounts, results) =
-            bank.load_and_execute_transactions(txs, lock_results, MAX_RECENT_BLOCKHASHES / 2);
+            bank.load_and_execute_transactions(txs, lock_results, MAX_PROCESSING_AGE);
         let load_execute_time = now.elapsed();
 
         let freeze_lock = bank.freeze_lock();
@@ -620,7 +620,7 @@ impl BankingStage {
         let result = bank.check_transactions(
             transactions,
             &filter,
-            (MAX_RECENT_BLOCKHASHES / 2)
+            (MAX_PROCESSING_AGE)
                 .saturating_sub(MAX_TRANSACTION_FORWARDING_DELAY)
                 .saturating_sub(
                     (FORWARD_TRANSACTIONS_TO_LEADER_AT_SLOT_OFFSET * bank.ticks_per_slot()
diff --git a/core/src/replicator.rs b/core/src/replicator.rs
index 70fb65bf12..d2c05fe3a6 100644
--- a/core/src/replicator.rs
+++ b/core/src/replicator.rs
@@ -500,7 +500,11 @@ impl Replicator {
                 > 0
         );
         // ...or no lamports for fees
-        assert!(client.poll_get_balance(&self.keypair.pubkey()).unwrap() > 0);
+        let balance = client.poll_get_balance(&self.keypair.pubkey()).unwrap();
+        if balance == 0 {
+            error!("Unable to submit mining proof, insufficient Replicator Account balance");
+            return;
+        }
 
         let (blockhash, _) = client.get_recent_blockhash().expect("No recent blockhash");
         let instruction = storage_instruction::mining_proof(
diff --git a/sdk/src/timing.rs b/sdk/src/timing.rs
index 19dfd2f344..71bea4bc2c 100644
--- a/sdk/src/timing.rs
+++ b/sdk/src/timing.rs
@@ -26,6 +26,9 @@ pub const MAX_HASH_AGE_IN_SECONDS: usize = 120;
 // This must be <= MAX_HASH_AGE_IN_SECONDS, otherwise there's risk for DuplicateSignature errors
 pub const MAX_RECENT_BLOCKHASHES: usize = MAX_HASH_AGE_IN_SECONDS;
 
+// The maximum age of a blockhash that will be accepted by the leader
+pub const MAX_PROCESSING_AGE: usize = MAX_RECENT_BLOCKHASHES / 2;
+
 /// This is maximum time consumed in forwarding a transaction from one node to next, before
 /// it can be processed in the target node
 #[cfg(feature = "cuda")]