[Android Central Question]

My ok google function works if I want to make a call or search in the internet for example, but to send a text hands free its stopped working.

For example, if I am in Google Maps and driving, I want to send a hands free text, I would say

"OK Google, text Mum"
and it would then say
"text mum, sure, whats the message?"

But then it just doesn't pick up anything I'm saying afterwards. Its just completely silent on me.

It used to work fine and then it got glitchy were it would be ok if i turned the device off and on again, but now its completely gone. the phone is only 3 months old.

Any ideas would be appreciated.