Hi there! I’m having the same problem and apparently it’s related to MRQ and Path Tracer:
No memory leaks after disabling PT.
One way to go around this is by writing a custom Python script that breaks the sequence in junks when submitting via command line (as mentioned by KOINUPENG). My python skills are quiet minimal though so it’s not working properly yet but I can post something once it’s working or someone can have a look and help.