Kingo Root issue

My android device is 4.4.2. I rooted my device with Kingo Root with PC. Without any error message, it was successful. However, after rooting Screen Lock is not working properly. Sometimes screen lock works and sometimes it doesn’t work. I removed root access and reset my device. Then Screen Lock is working fine. Again after rooting, Screen Lock is not working fine. I have been using Kingo Root with PC for long time. And depending upon scenario, I removed root access, reset device and re-root device. I never had any issue with it. Now I am facing Screen Lock issue. Please let me know, how to fix it? Regards InTech