rodgersgenya , You may want to try a hard reset as a corrupt App/software/etc., could be causing the issue(1st link below shows steps for resetting your phone). If reset does not fix the digitizer could be faulty or perhaps you could try cleaning the digitizers connection with a Q tip/soft cloth dampened with 90%+ Isopropyl Alcohol and reseat the connection. 2nd link show disassembly of device to access connections to enable cleaning and reseating. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
http://www.hardreset.info/devices/samsung/samsung-j105f-galaxy-j1-mini/
https://www.youtube.com/watch?v=FrC-q4vg3SA