Hello. My galaxy C5000 running on Android 8.0 now. 2 years i have been using it upgrading periodically from android 6. i never had issues with finger print before. The phone never rooted. few month ago upgraded to android 8.0 was working well then another update came by samsung saying some kind of security and other update patches so i did it. i guess after that my phone started indicating popups fingerprint sensor not responding if you see it repeatedly restart the phone. i did several times sometimes worked sometimes not. then i did firmware installation and reset via odin which downloaded samsung official site as i know. after it worked for some days but now not responding. now sometimes fingerprint starts working by itself and the stops again. i cannot identify whether its a phsyical damage or software problem. now the questions are: 1) is it a software or a hardware problem? 2) can it be related to last security update pach (with the volume of up to 200 mb) which was after android 8.0 installation? 3) can reverse back to android 7 from android 8? Thank you for your patience and help.