Mission Not loading in

[BOT_Shadow]

So warframe has always had this problem where sometimes when you would go into a mission and you are in the loading screen. You can clearly see the loading has been done by the progress bar but you wait for like 5 minutes which is way more then the usual loading time and you decide to just alt f4 the game because its clearly not gonna load in. SO then warframe automatically thinks you failed for abandoned the mission whatever. Usually this isn't a problem, just annoying to have a bit of time wasted. But today it happened during my mastery rank 21 test and now i gotta wait a day to do this test, now its really getting on my nerves, warframe please fix this issue, its been out for a long time and it still hasn't been fixed