Not sure how you are keying the amp but make sure the PTT delay is set right. I had to increase my to about 100ms. I was using a Heil double foot switch ( caused hot switching). Now I am just using the Flex internal PTT with delay.
Thanks for the info Larry. I have a foot switch plugged into the Flex TX1 keying line jack. I have the switch relay for the TX1 jack set for 100ms. I do not have an isolation relay between the Flex and thew alpha as is mentioned in the manual. I have never played with the switch timing. I think I will make some timing adjustments and see how the amp reacts.
I see that you are in Garland, I am in Heber Valley. During 7QP contest the world is always looking for those rare northern Utah counties.