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I know this is an old thread, I am a total newbie in crypto currency and since bitcoin is so expensive I decided to fork litecoin instead and learn more about it, still have alot to learn. I was having the same issue and so far after adjusting the rpcworkqueue i have not received the error in the past 30 minutes ill keep running it overnight and see if I will get the error.
Thank you for posting this solution.
I'm not sure what do you mean by "fork litecoin". However, you could use Bitcoin Testnet network, so you don't need to experiment/learn with real money. You can use faucet (such as
https://testnet-faucet.com/btc-testnet/) to obtain testnet Bitcoin (tBTC).