i have an Android RCA 7 Voyager and it is running into some issus

[AC Question]

for one year or so my RCA Android 7 Voyager has been working fine but then just today it said UI System has unfortunately stopped and then trying to solve it I shut it down and tried turning it on again but I will never load when its on the Voyager water mark loading it was still able to turn off and on but the screen wont load then I tried rebooting it still nothing then I tried the other reboot option but now it is doing the same thing before but at the bottom left corner it is saying "fast boot mode..." and now nothing works can I please have help =( .