Audio notes & voice recording stop abruptly in Google Keep

I've recently been trying Google Keep for its speech-to-text feature. The problem I'm having though is that it only records a couple of seconds then stops; usually about 2 to 7 seconds. I tried it several ways and made sure my fingers aren't on the screen while I'm recording, so I don't think I'm accidentally tapping the screen to stop the recording. Is the problem likely with my phone, or is there some setting I need to change? I assume I don't need to upgrade $ to make notes that are longer, do I?