Can anyone please help

Hi all. I updated my galaxy 5 a couple of days ago to the latest lollipop and since then when i make or receive a call it keeps intermittently cutting out. One minute i am listening and the next it goes dead then voices come back for a minute then it goes dead again and so on. I have spent hours trawling through posts but can find no answers or help.
Has anyone experienced this or had the same problem?
Thanks for reading this
Sharon