PTX EVO Platforms with the Software release PR1785056 is exposed to drop MPLS traffic on any incoming interface with MPLS configured (not just on the AE member link interfaces) with  the following potential triggers. or any other trigger which would need to recreate the AE interface.

* When family MPLS is removed from an AE interface, or 
* When an AE interface with family MPLS configured is deactivated or 
* When the MTU is modified on the AE interface that has family MPLS configured.

MPLS traffic might be dropped on interfaces or AE interfaces upon the following triggers or any other trigger which would need to recreate the AE interface.

Software fix is required to avoid this issue.

Please refer the following PR and contact the JTAC for any assistance.




https://prsearch.juniper.net/problemreport/PR1856732