Hello,
Could you check on scope if there wasn't any drop voltages when the reset occurred?
You can also check the ME module RGM [FES and DES] registers for its content after reset. There are logged reset sources.
Also you can check FCCU module NCFS flags for issue root cause (remember to set 0xA to the Control (FCCU_CTRL) OPS field).
If possible share them with me so I can see where is the issue.
best regards,
Peter