evmconnect fails to advance a listener on Polygon mainnet

I created a new local FireFly stack and pointed it at Polygon mainnet. I attempted to index an existing ERC-20 token on chain and it appears that the listener never advanced and was continually stuck in `catchup` mode.

I noticed a few of these errors in the evmconnect log
```
[2022-08-30T18:39:38.569Z] ERROR evmconnect: Failed to query block range fromBlock=16116928 toBlock=16118927 headBlock=32490938: FF22012: Backend RPC request failed eventstream=0182f00c-39d1-5b17-f41e-0e1eac1c8fc6
```

Full logs attached

[ethsigner.log](https://github.com/hyperledger/firefly-evmconnect/files/9456716/ethsigner.log)
[evmconnect.log](https://github.com/hyperledger/firefly-evmconnect/files/9456717/evmconnect.log)
[firefly_core.log](https://github.com/hyperledger/firefly-evmconnect/files/9456718/firefly_core.log)
[tokens.log](https://github.com/hyperledger/firefly-evmconnect/files/9456719/tokens.log)