Yes! That's exactly what I mean. It's so irritating, especially when there's absolutely no reason you should be hitting the wrong note.
Yeah it was happening to me when I was playing Chopin's prelude in C minor, I ended on C major at the end a few times and in the middle I keept playing some random chord and it just made it sound like some incidental music to a TV soap!

lol. Doesn't happen now though.

Then there is the general frustration of just not being advanced enough.
Plus having a naff piano.
And no one to play to even when you do get it right. 
It's a good job deep down I love it really haha.
Ha ha thats all true for me too!

, I'm a beginner, I wish I was grade 8, I wish I had an acoustic piano as well as my Clavinova, and if I did decide to play in front of someone I would make a mistake

. But yes I have a love-hate relationship with my piano, although its mostly love

.