That sounds like a repeater issue but to confirm, Locks should be within 6 feet of the panel during the pairing process and left there for about 5 minutes after pairing to complete secure enrollment.
30 feet from the panel to the lock with no other repeating nodes is likely too far. Placing a repeater in between should help. There isnt a hard and fast rule on distance between nodes but 20 to 25 feet should be ok. Local testing is always recommended.
While there are specific Z-Wave devices that are only repeaters, basically any Z-Wave device that plug s into the wall (not a battery powered device) will act as a repeater.
Qolsys has a list of devices that have been tested compatible with the IQP4. This is a good place to start when looking for devices.
More information on setting up a Z-Wave network, including pairing steps and best practices can be found in the below guides: