502 Bad Gateway in EDIT page

Content

We are using SaaS Custom objects using Rest APIs . We are able to successfully test PUT in Postman as well as while creating service connections in VBCS.
When we are trying to use edit functionality and Click on Save in Edit page , We are getting below error 
Request Method: PUT
Status Code: 502 Bad Gateway
Remote Address: 10.177.38.133:80
Referrer Policy: no-referrer-when-downgrade
and page is not navigating back to calling Page. Interesting thing to note here when I am trying to update same record using postman ,I am able to do that and after that Edit page works fine in VBCS for that record and gives no-referrer-when-downgrade for other records.