I think GPIF2 is very sensitive.
FX3 sometimes hang-up when between communications of host computer and GPIF2.
Do you know this trouble?
More details about the application and GPIF project might be required to identify the root cause and fix the sae. Please create a tech support at www. cypress.com -> support -> Technical Support. One of our engineers will take a look at the same and help in fixing the issue.