The BPS/PPS (bits per second/packets per second) counters can fluctuate (unexpectedly high or low) for several seconds. The example of such fluctuation is:The issue can happen without any trigger. All Junos EVO products are affected.
The issue has been present in Junos EVO from day 1. No workaround available. The issue has been fixed in the PR1723808. The fixed releases can be seen in the PR.