Are you currently trying to configure the IPS inline or with a span port? If the IPS is set to inline, try setting to SPAN while you are getting it setup as inline will require the IPS and both neighbor devices to have link for the ports to remain enabled.
Try setting the 'gigfailopendelay' to a larger value as it can help while troubleshooting.
'set gigfailopendelay 30' (value can be between 0 and 600 seconds)
See your setting with 'show gigfailopendelay'.
It may be worth reseating the modules and cables or trying a different port also. We see alot of problems that are resolved by reseating everything.