JSON API Ignoring filters

JSON API Ignoring filters

I have a view that presents some data to an external software client as json. On the url we filter the returned records using a named column in the view. 

As of this morning the column we provide is no longer filtering the records and returning EVERYTHING in the view.

I've raised a support call but the customer who is using the software client has now had the remaining confidence in Zoho blown out of the water (we had BOTH of the creator outages during the pilot) this morning.

The view hasn't been touched in weeks and has been working perfectly for months. 

Any ideas?