Hello, I bought this new rMBP few months ago and recently have noticed an issue. maybe about half the times I wake the laptop up from sleep, I get a black screen with a cursor for 10 to 30 seconds. after the time has passed, the laptop will wake up as normal and be fine again. I have done some searching but most just seem to point towards making sure the laptop is updated completely and issues related to spotify app. (my laptop is up to date and I never had spotify) I tried the booting in safemode, but it never asked me to "complete OS X installation" it just boots up as usual in safe mode. Screen flickers constantly when in safemode. but a restart resolves that. does not fix black screen and cursor issue. not sure what else to do. It is really annoying me thanks in advance for any suggestions.