Hi @Deepa7593 and welcome to the community.
I'm sorry to hear this. I recommend that you force shutdown your device by holding down the volume up and on/off key simultaneously for at least 10 seconds, then start your device as normal.
I would also recommend that you perform a software repair using Xperia Companion to see if this behavior is caused by anything software related in your device.
If there is no change I'd recommend that you get in contact with your Local support team for assistance with having your device sent in to an authorized service center for further trouble shooting and repair.
Let me know how it goes.
