The cw key clicks instead of a tone.

[Lisitz]

Yesterday something strange happened. The cw worked all day without any problems, but in the evening the tone of the telegraph key disappeared. Instead there was a click. I haven't made any changes and don't know how to fix it.
Maybe someone has had this happen, please advise how to solve this unpleasant problem.
Thank you.

upd: i've found interesting - in practice mode tone is apperars and works fine. after switching it back to "practice mode - off" key clicks again

[DL2MAN]

Have you tried a reset ?
Push and hold Rotary encoder while powering up
Warning: After that, you need to calibrate frequency again and other settings you made.

If that doesnt work: re-upload firmware.

73 Manuel; DL2MAN

[Lisitz]

Have you tried a reset ?
....
If that doesnt work: re-upload firmware.

73 Manuel; DL2MAN

Thank you, Manuel!
It worked.
I reinstalled the firmware, did a reset and everything works fine again!