On Junos OS Evolved PTX10001-36MR platforms with Coherent Optics (400G-QDD-ZR, 400G-QDD-ZR-M , 400G-QDD-ZR-M-HP and 100G-ZR), the picd (port interface concentrator daemon) leaks memory during normal operation, which will lead to its crash resulting in traffic loss.

You can notice the following log message before restarting the picd

Killed process 12653 (picd) total-vm:15792364kB, anon-rss:6188528kB, file-rss:484kB, shmem-rss:0kB

Please find the picd memory utilization by running the command show system processes extensive | match picd
Please restart the picd in a maintenance window before the memory consumed by the picd reaches its maximum limit. 
The maximum memory limit of picd can be identified by show system applications app picd detail | match "Max Memory"