Sandisk Ultra Fit 128GB disconnecting while format

Hello, i can see the pendrive correct size but when i want to format it is disconnecting and connecting - format fault.
Any tool can help?

Why are you trying to format it? If it’s new it doesn’t need to be formatted.

its not new. I was using for about 2 years with no errors. Now then im trying to write data - copy fault. So i was trying to format but then disconnected and connected after aroud one secound and format fault. after thet is disconnecting and connecting back every couple secounds.

The connecting / disconnecting sounds like an electrical connection problem. Lightly cleaning the port and USB contacts with emory paper should help.

The write data - copy fault sounds like something a chkdsk /f terminal command can fix. And the Command Prompt needs to be Run as Admin mode. (requires a right click to invoke)

Unfortunantly, checked in few usb ports and cleaned pendrive connectors and didnt help.
chkdsk /f also showing like below
The type of the file system is exFAT.
Volume Serial Number is 1228-8A62
Windows is verifying files and folders…
The upcase file content is incorrect.
Corruption was found while examining the volume bitmap.
The upcase file content is incorrect.
Corruption was found while examining the volume bitmap.
Corruption was found while examining files and directories.
An error occurred while examining the volume bitmap.

OK! Try chkdsk with all 3 of these options at one time:

chkdsk /f /r /x

plus the USB’s drive letter. And it must be run in Admin mode like the last time.