[Elecraft] K2/100 Problem on 80 meters

[Pierre]

Hi to all

I have a problem on my K2/100 that manifests itself only on 80 meters: 

If I operate QRP at 10 watts, I can match my antenna with a manual tuner, the SWR is very good near 1:1, and the rig operates smoothly.
But as soon as I switch (via power control) to QRO, without changing the settings on the tuner, the reflected power needle swings wildly as soon as I stop keying, even at only 11 watts. 

For all other bands (40 up) the rig works fine QRP or QRO.

I would like to know where to look at.. ?

Thanks for your help!

Pierre VE2PID K2#5170
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