uBitx v6 tx "sticky" on 20 meter and high

Rene
 

Hello, i hav a V6 and at the moment is the use for listening to FT8 and some phone. When I put the radio on a dummyload, then it seems the tx button keep on tranmit, even when i release the mic. After a few time push on tx, then it release and is on rx again. How come?? Maybe relay hanging??
Regards
Rene

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