Sick Mandavilla... Fungus, Sun or what?

I have a few Mandavillas for a few weeks they were doing great until i moved them to a planter where they get 8 hours of sun a day and shadow for the rest. I untangle them and used a Lattice to help them to climb the wall. The very next day next day i discover these horrible spots and i do not know what is wrong.
I live in las vegas, temp here now is around 100 degrees. the plants soil is moisture and everything looks fine except for some leaves. I looked around and i could not find any pets. I have some roses that are a little bit sick and i'm taking care of them now ( yellow and black spots) but the Mandavillas were great until u move them to the planter. they still in their own pots, i just change their location. Please let me know what you think