After trying search all posts to find what speakers the OP has, I believe it’s the speakers, causing amp shutdown.
As every post the OP does says nothing about what speakers he has, mentions models of everything else, the only thing said by the OP about the speakers he has is that they are
" My speakers take 200w continuous with peaks to 800w or 1000w"
Something just don’t smell right here.
Cheers George