Hi @Amir2099 ,
A quick few questions to help you out.
Do you have your phone restart every few days? (Normally setup for nigh time)
Have you tried deleting you only finger print and re adding it?
and finally have you added a screen protector?
But first of all I would say give it a restart and try again then look see if you have added any new apps since you noticed this slow down.
Get back to me and let me know if this is any help