Sounds like something you are installing is giving you problems. Have you tried starting it up in "Safe Mode" to see if it will fully load then? If it does, then you likely have a bad app, virus or malware that is being installed when download an app or file, or visit a specific site. The only way to resolve that, should it be the case, would be to remove the problem app, virus, malware, etc. and not readd whatever is causing the problem to the tablet.
To get into "Safe Mode" please do the following.
1. First turn off the tablet.
2. Next press and hold "Power" until you see the manufacturers logo on the screen, then release the power button.
3. "Quickly" press "Volume Down" and hold it for few seconds until you see the message "Safe...