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It's possible you are getting a notification and the notification flash given your theme is that color.
Although I'm not sure, as I am not familiar with that device but when does it happen? As you are using any app? Perhaps after a set amount of idle time? Does it stay that color? Does it go black at all when timing out?I'm not running a theme. Is it possible the phone has a screen saver when it goes idle?
I am fairly certain that you are seeing a notification flash. Do the following: –
go to Settings/Accessibility/Advanced settings/Flash notification.
On that screen you will see an option to turn on Screen flash. Turn that off or switch to Camera flash
when it turns is color, does it act like a screen saver? does it do it after the screen times out? when does it happen? how often? can you post either a screen shot or a picture of your phone when it happens?
Go into settings>display>screensaver
And you can turn it off or even change the color of it.