[Elecraft] Strange K3's issues

[Tom SQ5CSF]

Hello everybody, 
I have a strange issues in my K3. Maybe someone has had similar symptoms and may help me... 

chronology of my actions with K3 

- from the begining K3 was never opened, worked fine. 
- 2015-06 - KXV3 installation 
- 144 QSO made in this period time - no issues. 
- 2015-12-31 Last firmware upgrade (5.38/1.25/2.86) 
- 26 QSO made in this period time - in January - no issues 
- SPDX contest (2016-04-02)- in my contest location - first operational problems. 
During the contest I have made about 40 qso. 
Many radio restart have been made to be able to work at all... 
symptoms: when I have pressed mic's PTT, TX led switch ON but there were no power output. 
The same situation was when I have used footswitch or playback message option. 
After few pressing of the PTT output power appeared. 

Next point was the AUT - time of the tuning was tottaly differen between next tunes. 
Next point - AF gain controls for main receiver. 
Radio was not reading the knob position to change the volume. 
Band change removed this issue for some time. 


- Home station - 2016-04-10 
Previous problems disappear, now i have a problem with the K3 power off. 
It's look like not complete internal procedure. 
whole firmwares were reloaded - issues still exist. 
configuration was restored from 2015-08 - issues still exist. 
Older firmwares were downloaded - issues still exist. 
Actual firmwares were downloaded with last saved configuration - issues still exist. 
- next point - when I switch on my Diamond power supply - K3 power on automatically. 


Some shots made by mobile You can have a look on vimeo: 
https://vimeo.com/162290764 

I will be grateful for any comments / tips 
Tom 
SQ5CSF