Series 8 Apple Watch and VoiceOver

Hi all, I recently baught Series 8 GPS watch and facing very strange problem. Sometimes I get notification then voice over quit speaking. I tried turning it off and on but voice over continues to be non-responsibe. did connect with apple tech support and advised to unpair, restart the watch and then pair. Frequency of voice over quit speaking has reduced but problem still persist. Any recommendation on how to overcome this issue. Thanks a lot in advance.