For me it's point of view lapses. When I started writing I always wrote in, what I thought, was third person omnipotent, but I was constantly told that I was writing third person close with numerous POV lapses. That used to make me crazy. I mean who the frack are they telling me what POV I was using? I'm the writer right? Don't I get to choose? Apparently not. I came in too close for it to be third person omnipotent and I was promised that third/close was the way to go. I found this so frustrating that I gave up and started a new novel using two separate POVs - one in first and the other third/close. I found writing in first much easier but I hated the character's voice so much that I gave up and started a different novel - this time in first person.
I found writing in first easier in many respects and the POV lapses disappeared but then I had to cope with the structural difficulties of how to deal with the goings-on of the other characters when not with my MC. The dialogue began to become unwieldy and forced as I tried to invent new ways the MC could uncover what was going on.
AAAAARRRRGGGH!
Is it any wonder that I walked away in frustration? I just want to tell a story. Who knew it was going to be so hard?
Then at a critique session when the inevitable question of POV came up on an old MS of mine one of my critique partners said, "To me this is very cinematic. It feels like you're calling shots and setting up scenes. It reads more like a screenplay." I think she meant it as an insult but it was like a lightbulb going on for me.
What if that's what I should be doing? What if that's how I should tell my stories?
So I bought some software and I started to adapt one of my MSs into a screenplay. It was quite tricky because I had worked so hard on getting the POV correct and suddenly having the freedom to switch the camera angle so the audience can see something the MC can't was as terrifying as it was liberating. But I liked what I was able to achieve. So for the past couple of months I've been learning how to write screenplays. I think that if I can just get the story down and done then figuring out how to structure it as a novel will be just a tiny bit easier.
Yes I'm still going to write a book.
Why?
Because if you think getting published is hard, just think how next to near impossible getting a movie made is.