Client is reporting a downturn in conversions on their Umbraco forms. Visitor numbers are consistent but seems (anecdotally) that some form submissions are hitting the bot check warning. Is anyone else experiencing similar?

Yep, I've experienced this a month or so ago. Had to adjust the recaptcha threshold since real users consistently scored lower than they did a month prior

Hmmm sounds more like a recaptcha issue than anything else then?