Why backup job and integrity check collide??

Hi everybody

I'm a new member here .

I've just upgraded VDP to 5.5 and found some strange things. The VDP running with integrity check during backup window. Backup job and integrity check collide.  After that I often face the crash problem. Status of core service has changed to “Unrecoverable” . I must rollback to recovery point and lost some backup. Something's wrong?

I have run manual integrity check during backup window, but at that time no any backup job running. Is this the cause of the problem?

Thanks in advance

Pannikin