I don't really care about dieing before round 20 in solo, it is still easy to get my perks back and IMO round 1-20 are harder than the rounds afterwards.
I hate when I'm feeling so awesome about a game and it's going to great and then suddenly I get stucked and downed, and at the beginning of a round I can't get my perks back, so game over.
When I felt to make it high....
I do hate it also when I down at Ascension. I ALWAYS die at the left side of the stairs to PHD, next to the random box.
It is mostly easy with thunder gun, but it is a waste of ammo. Or I'm unlucky and don't have the thunder gun on round 23 YES that happpened to me and then there is no way to escape.
Even when the zombies are coming from both the stairs, so the chance of getting stuck is een higher.
When the max zombies have spawn it's way easier. But in the early there are slow zombies which can block my way much easier, hence why I die more times before round 20 or so.