hi,

Should I try with a new one?

No, post your code here first of all. There may be an error there.

What can be the problem? Could there be a problem with LCD.

The problem may be that you send data bytes to RAM locations 0x00..0x0F.
But 161A serie has display positions:
1..8 at addresses 0x00...0x07
9..16 at addresses 0x40...0x47.

As result, you should use SET DD RAM ADDRESS command before print last eight characters.

Regards,
Oleg