Intermittent issue communicating with Home Assist

I’m setting up a flow to send tts to a speaker and am testing things out. Around half of the time when I inject I get the following error:

“Call-Service attempted without connection to server.”

But if I try again it typically works. What could cause it to sometimes not be able to communicate with HA? Forgive me if I’m not including relevant details, just started using Node Red and trying to get the hang of everything.

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Ah, that makes sense. Thank you!