Transaction Fails with “Not Enough Funds”

General
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1

i am getting the issue
Request_Endpoint: POST /api/contract/gameSession
user balance - → 0.000468434
Request_Endpoint: POST /api/contract/gameSession
user balance - → 0.000468434
Request_Endpoint: POST /api/contract/gameSession
Request_Endpoint: POST /api/contract/gameSession
Request_Endpoint: POST /api/contract/gameSession
user balance - → 0.000466562
Request_Endpoint: POST /api/contract/gameSession
user balance - → 0.000466562
user balance - → 0.000466562
Error while creating game session: _FuelError: The account(s) sending the transaction don’t have enough funds to cover the transaction.

  try {
    let { privateKey, network, networkNumber } = req.body;

    if (!privateKey) {
      return res.status(400).json({
        message: "private key is required.",
        status: 400,
        success: false,
      });
    }
    const nodeUrl = getNodeUrl(networkNumber as NetworkType);
    const provider = await Provider.create(nodeUrl);

    const userPrivateKey = privateKey;
    const userWallet = Wallet.fromPrivateKey(userPrivateKey, provider);
    const balance = await userWallet.getBalance();

    // eslint-disable-next-line camelcase
    const contract = new GameSession(
      GAME_SESSION_CONTRACT as string,
      userWallet
    );

    const id: IdentityInput = {
      Address: {
        bits: userWallet.address.toB256().toString(),
      },
    };
    const sessionStarted = await contract.functions
      .get_game_session_started(id)
      .get();
    const calls = [
      contract.functions.get_game_session_started(id),
      contract.functions.update_game_session_increase_score(id, 1),
      contract.functions.get_game_session_score(id),
    ];

    if (!sessionStarted.value) {
      calls.push(contract.functions.start_new_game_session(id));
    }

    const { maxFee: totalMaxFee, gasUsed: totalGasUsed } = await contract
      .multiCall(calls)
      .getTransactionCost();

    const formattedBalance = (parseFloat(balance.toString()) / 10 ** 9).toFixed(
      9
    );
    console.log("user balance - -->", formattedBalance.toString());

    if (balance.lt(totalMaxFee)) {
      console.log(
        "User wallet has insufficient funds, funding from sponsor..."
      );

      const sponserWalletPvtKey = getSponserWalletPvtKey(network);
      const sponserWallet = Wallet.fromPrivateKey(
        sponserWalletPvtKey,
        provider
      );
      await sponserWallet.transfer(
        userWallet.address,
        totalMaxFee.add(new BN(0.0001 * 10 ** 9))
      );
      console.log("User wallet funded successfully.");
    }

    const updateTransaction = await contract.functions
      .update_game_session_increase_score(id, 1)
      .call();
    const session = await contract.functions.get_game_session_score(id).get();


    return res.status(201).json({
      status: 201,
      success: true,
      message: "Score Updated Successfully",
      data: {
        transactionHash: updateTransaction.transactionId,
        sessionScore: session.value.toNumber(),
      },
    });
  } catch (error: any) {
    console.log("Error while creating game session: ", error);
    return res
      .status(500)
      .json({ success: false, error: error?.message ? error.message : error });
  }
};

this is my code.
This error occurs when
I am hitting multiple requests at the same time.
when I send a single request, then there is no problem related to funds