leaf spotting on epi capricornu
 

I have this epidendrum species called E. capricornu. One by one the leaves have yellowed and died and now it is happening to more leaves at a time.. I've been spraying with physan about once a month but it doesnt seem to matter.. Does anybody know what might be causing this?

Ben

Too much light? To hot? Those are the most obvious.

My first thought was burn ... hopefully others will be chiming in. Good luck!