Playing but not

hey peeps
so played diablo 3 for some time,but now have a problem…when i start the game i get the diablo 3 logo then i get the grey screen after that i get to the char screen after the 30 seconds login timer i get booted back to my desktop i open the blizzard desktop app it shows now playing on the app but can see the game so ima having to use task manager look for diablo 3 retail in running apps,then i have to expand it then bring to front in order to play the game, i have to do this every time now in order to play its getting annoying as never had issues before

anyone know the prob or a fix??

T I A