Losing voice assistance on Maps

I’m having a problem I have already seen posted but wanted to add my two cents. My Maps voice assistant helps me leave the driveway then is silent. I travel alone frequently and to places I haven’t been frequently, so I really depend on it. The frustration of thinking it’s working then getting to congested areas, ie. CHICAGO, and it’s back to the 80’s. No help. So I prefer maps to google as far as the interface goes, (Irish voice is fun) but it is so unreliable I daren’t use it for trip to the unknown. Oddly, it tends to work more reliably on my way back from a trip, this leads me to think it has something to do with cell towers, location? Why on earth not working to a place, but yes on the way back? More than once. Exactly the same issue with my iPhone 13, and now my 15pro. !??????