I have a Yaesu FT-2600M that turns off when keyed up, then comes right
back on (in all power settings). I know the radio has high SWR
protection and have tested the SWR on my antenna (Comet GP9N with 9913)
and it's extremely low with an Icom IC-V8000 radio at full power. Does
anyone know what could cause this? It wasn't used for a year or so
before this and was working fine. It was mounted in my work van for 3
years. Under the cover it looks bran new with no blown components or
smells. Thanks for any help.

--Mike