Phone locking up in my contacts can not make call

[ONEBUDJACK]

contacts page will not open most of the time samsung-galaxy-s4

 

[mhinc]

contacts page will not open most of the time samsung-galaxy-s4

Based on knowing nothing about whether you are running a customer rom, 3rd party software, etc..
The best I can tell you from what YOU have said, is backup your contacts and do a factory reset.