Hello,

We have 4 apex jobs that are consuming some webservices, to fetch some data ( account related information). That information is stored on a custom object that have an external id Field ( to user Upsert ). The webservices are returning around  2000 to 5000 records each month. 

The service was working well for about 8 months now and in past month we start getting this message on apex jobs logs : 
" Message could not be processed and ended up in dead message queue ".

I have checked and the werbservice is working and returning the same amount of records than previous months. 

Anyone know what can be this error from?

From what i have checked this can be related to a query, but on the Apex Job we are only transforming the data received into the Custom Object and then doing an Upsert on that Custom Object.

Any help is appreciated,
Thanks 

André