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I would respectfully suggest that people are jumping to conclusions without logical thinking.
Perhaps if the original poster bothered to read answers, it may help.
I have asked what size PSU he is using, as did another, but no reply.
I asked if it did it on FM, no reply.
It is displaying symptoms of drawing too much current, hence my questions.?
If PSU is too low a capacity, it will cut out. FM being a full current mode, it will cut out. Ignore the FT8, go back to basics and fault find. Put the radio on a dummy load, connected to a known good PSU, and try it again.
You could even check the power lead for dirty fuses or connections, as that is known to cause problems.