When I use my external Monitors (Dell, only 3 month old) in combination with my newest generation MacBook Pro Illustrator crashes all the time when the monitors are set into standby-mode. Strange to say this issue only appears when the monitors are in standby-mode for more than 10 Seconds!

After 10 seconds waking them up illustrator only shows one of my tool-options. No toolbar, oder canvas. At the moment it's really hard for me to work with this issue because i need to restart illustrator all the time to get rid of it.

in my overview illustrator shows up, but by clicking the window nothing happens. Screenshots attached.