My iPad is not restoring!

Hi,

last week my iPad had some lag for the first time since I bought it,so I decided to restart it.It took too many time to turn off and restarted alone showing apple logo for about 30 mins.Then it started flashing:apple logo,black screen for 30 mins so i forced it to turn off successfully.

I tried to update and restoring it via ITunes many times it works until “verifying update with apple” and it turns off suddenly,I tried multiple laptops,USB,IOS versions and same problem.

it is now stuck on restore mode.

Does anyone have any suggestions please help me.