Logs are full of:
Sep 19 14:41:32 re0.cr1-esams fpc0 dispatch_event_handler(691): EA[0:0].disp[3] SECONDARY_TIMEOUT (PPE 5 Zone 19). Sep 19 14:41:35 re0.cr1-esams fpc0 dispatch_event_handler(691): EA[0:0].disp[3] SECONDARY_TIMEOUT (PPE 5 Zone 19). Sep 19 14:41:38 re0.cr1-esams fpc0 dispatch_event_handler(691): EA[0:0].disp[3] SECONDARY_TIMEOUT (PPE 5 Zone 19).
relevant doc: https://supportportal.juniper.net/s/article/Syslog-message-SECONDARY-TIMEOUT-or-PRIMARY-TIMEOUT?language=en_US
TLDR, FPC restart is the first step.