Yesterday when I put the tablet on it said it was installing updates, after it did that the message came up process system is not responding do you want to close it options wait/ok, but it was frozen not allowing either. I managed to shut it down and restart, then I got the message to update galaxy play store which I did. But then it seemed to connecting and disconnecting to wifi and when I went to settings it said settings had stopped. This morning it won't even switch on, I don't know if its the battery so I connected charger still nothing.
Doesn't sound optimistic. For sure ensure that the battery is charged. It try turning it off for a longer time too (can the battery be removed from the tablet to ensure a complete power down ?) Aside from that, if it's totally dead, probably needs to go to the workshop for investigation/maintenance. I'd be inclined to think it was coincidental to the updates rather than caused by them.
Thanks old geezer I did manage to start it, so battery was OK and charged. Still getting the settings stopped message. I will go on live chat with samung to see if they can help.