Probably a few times. Things like a dc at the end of an expensive craft, particularly toxic groups, being blamed for other peoples mistakes when you're outperforming everyone by double and the group agreeing with it, extended periods of lag. Though I could count the occasions on one hand, it never lasts long and it's usually when I'm tired. You just have learn to roll with misfortunes and shrug it off and life feels a lot better when you aren't constantly frustrated.
My own biggest issue is more with getting discouraged too easily when things go bad. I tend to kick myself from groups after 2-3 mistakes and didn't clear the new Trial on Normal for a week because I felt I just wasn't playing well enough to queue, despite clearing and almost hitting orange on EX 3 days later. I take slip ups and off-days rather badly regarding confidence.
