K3 AM power increases

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K3 AM power increases

Shep Brokaw - W2BSB
When I transmit on AM, the carrier level increases on each modulation peak. The carrier power starts out at 30 watts and increases up to about 80 watts over a period of several transmissions. By that time the modulation becomes distorted.
All I have to do to reset it is start to adjust the power adjustment and the power drops back to 30 watts.

I also have the same problem where after I hit the TUNE button, the AM carrier level goes to 80 watts until I touch the power control.

I have tried all versions from V2.22 to V2.67 with no difference.

Has anyone else experienced this?

Thanks
Shep - W2BSB