why i am facing this problem when my device is in warranty

Hi purvit123,

welcome to the Apple (user-to-user) Community.

Re: why i am facing this problem when my device is in warranty

how can i solve this ? should i submit this device to apple store ?

We'd like to help.

As we don't know which device, which OS, or what the problem is, there's not a lot we in the community can offer.

For seeking help from Apple: There are at least three ways to proceed:

(1) One way is to find and enter the serial number online as a starting point:

Find the serial number of your Apple product - Apple Support

You can enter the serial number on this webpage, and follow the instructions provided there.

Check Your Service and Support Coverage - Apple Support

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(2) For a device under warranty:

One stop for technical support, Apple hardware service, and software support.

Call Apple Support at 1-800-APLCARE (or use the app)

AppleCare Products - Apple

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(3) To seek assistance in an Apple store: (please take proof of purchase (eg receipt) and ID with you.)

  A Genius Bar reservation is recommended:

Genius Bar Reservation and Apple Support Options - Apple

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If nothing above suits:

More info: Product Service and Repair Information - Official Apple Support

or

Apple phone numbers around the world

Contact Apple for support and service - Apple Support

All the best :-)