|Replacing a psu with a bigger one each time is the equivalent of fitting a 6" nail or higher rated Circuit breaker. |
But ok, I'm sorry for my facetious comments.
As to the problem. The only thing I would suggest as it's so intermittent, is replacing parts one at a time.
I googled for common causes, http://www.google.co.uk/webhp?rlz=1...
Not sure if that will be any help.
A thank you would be nice, if I have helped.