Carplay issues - No Siri voice after a few interactions
Can't find an exact replica of my issue already posted, so here goes.
I'm driving a 2016 Peugeot 2008. Listening to music and following map guidance is fine (although there's a different story there).
Problem is with using Siri. Example, just now I'm driving and get a text from my wife - Siri reads it out and i dictate a reply. What Siri reads back to me isn't quite what I said, so I dictate the message again. What gets read back is fine and the text is sent.
When my wife then responds to my text, Siri no longer reads it. On screen everything looks like it should, but there's no voice, if i dictate a message it looks like it works, but having no Siri to read it back to me I can't tell what my wife's text said or whether what I've dictated back has been capture correctly.
Simlarly if I use Siri to search for a song, works for a few times and then silence.
iPhone 7 Plus with 11.3.1. Many thanks.
iMac, macOS High Sierra (10.13)