stm32L051c8 failed to erase memory

[prudhvichitturi]

Tried to erase , recently i keep getting this error , 

when attempting to erase through IDE even though not successful , after several tries it programs.

[Tesla DeLorean]

Ok, but no one here is familiar with the specifics of your board design. Provide MORE contextual detail.

How do you have this wired to the ST-LINK, is NRST connected?

Any watchdog on the board, that might break the connection?

Does pulling BOOT0 HIGH help with making a connection?

Issues with Power on the board, a brown-out might cause the chip to reset / stop responding.

[prudhvichitturi]

J3 is where i am having trouble, as mentioned it deosnt happen always.

the option bytes shows the read protection/write protection has not been enabled.