Microphone Well shut off between blocks in Google Chrome whenever you move it or hit the is shuts off on Google chrome and Safari

did all that and it still will shut off when I move the space bar Or move it to a new block I tried setting up a new user and using it it does the same thing I checked the control access to the microphone and I also checked the Dictation messages and the Mac I am running big slur it's a brand new computer I hate to send it back but I think I may have to this is unheard of not working in Google Chrome It is very difficult to name the pictures in my business because you have to go block the block to name pictures and every time you go to a different block you have to come here hit the command key twice it's very irritating it did not do that in high Sierra

it happens in all browers not just chrome but i need answer or will send it back this is not worth the 4100.00 i paid for it to do this. apple support did not know what to do either ! i was on the phone with them for 2.5 hours and they stated to me to ask the forum so i did