Sometimes there are gaps of up to 30 seconds where no zombies appear, so you can't score.
There's nothing you can do about it except pay up or restart your streak.
If you you watch carefully you will notice a pattern, the first match is easy, the 9th harder, 10th usually lose and the 11th is impossible.
I occasionally win the 10th but i have never won the 11th, ever.
This doesn't take into account being beaten by a better player when the pattern resets itself once you pay the gem tax or restart your streak.
There have been many posts about this and similar subjects in this forum or on reddit.
I see I am not alone in this issue after all
