Bandwidth Statistics causes apache graceful restarts?

Hello In recent days I have noticed several restarts of Apache, and they match with the schedule of Process bandwidth of the accounts. Process bandwidth causes restart of apache? In apache error_log i have many logs like: [Fri Apr 06 14:07:36.002682 2018] [mpm_worker:notice] [pid 31987:tid 140295043664000] AH00297: SIGUSR1 received. Doing graceful restart