Tablet randomly reboots. Also says laucher3 isn't working

I brought my Lenovo tab around 2 weeks ago and since having it I keep getting messages saying laucher3 has stopped. I read online to clear cache but it keeps coming up and I have to hard reset. also at any point playing games or on any apps a system message comes up saying reboot required and a count down for 2 seconds. When it reboots it goes into a start up loop and hard reset required again.