galaxy tab 2(GT P3100)problem turning on

I am using a galaxy tab 2 (gt p3100) for more than couple of years now.It was mainly used for occasional net surfing and whatsapp.

Very recently while i was surfing the web the network bars disappeared.I closed it but was not starting after though my battery level was about 20% .

I removed the sim card and even connected it to the charger but still wasn't turning on.After so many attempts it finally turned on.

when i began net surfing the exact same problem taken place once again.

What can i do.

I haven't updated it's firmware since i bought it.

A firmware update is available. Can it solve my problem.

I have attached a screenshot below: