System Workbench for STM32

Hi Team,

Recently i was using stm32 stlinkv2 in the STM32F411CEU6. They debugger was workig fine . After flashing 10-20 times , the debugger stopped working and throwig up the error:

STMicroelectronics ST-LINK GDB server. Version 7.4.0
Copyright (c) 2023, STMicroelectronics. All rights reserved.

Starting server with the following options:
Persistent Mode : Disabled
Logging Level : 1
Listen Port Number : 61234
Status Refresh Delay : 15s
Verbose Mode : Disabled
SWD Debug : Enabled
InitWhile : Enabled

Target no device found

Error in initializing ST-LINK device.
Reason: No device found on target.

and a pop up notification stating as follows :
__Error in final launch sequence:

Failed to execute MI command:
target remote localhost:61234

Error message from debugger back end:
localhost:61234: Connection timed out.
Failed to execute MI command:
target remote localhost:61234

Error message from debugger back end:
localhost:61234: Connection timed out.
localhost:61234: Connection timed out.__

I kindly request a solution for the debugger issue that iam facing. Pleaese refer to the attachments below. i tried firmware upgradtion in STM32CubeProgrammer. The IDE , iam using STM32CubeIDE.

Thanks and Regards
Neelima S