Error when connecting with square account on woocommerce

hi i was using square payments plugin on my clients website, there was no issue but suddenly this week it got disconnected from the square account and my client get call from there customer that there is no payment options available. When I checked it is asking to connect to square but when entering the login ID and password to connect it showings something went wrong try again later.. I checked with test transaction it is processing but when changing to live it is not connecting… Plz suggest something to troubleshoot the problem…