Salam Many times when I pray namaz, i unintentionally make pronunciation mistakes. Then, sit down immediately while praying, say ‘AllahoAkbar’, break the namaz , and start the namaz again from beginning with new niyyat. Am i doing Wrong or sin?

You don’t need to break the namaz
You must read again for example said صراط المستقيم
There was mistake then repeat the correct one. And concentrate in Namaz inshallah you will not mistake.
Iltemas. E dua