This is normal to happen, mainly when you are in need of money or in the beginning of evolution. What you should do to reduce this is: Do not create too much expectation when you have a lot of chips in a tournament, in the final stretch, always seek to make the best decisions within your knowledge, and always seek more knowledge, always seek to evolve. This makes your frustrations decrease over time, the more knowledge and experience you acquire, you will realize that you will not be so frustrated when you fall out of a tournament final stretch, or because of a bad phase you are not getting results, and it's also normal to get a little frustrated when you fall down a very important final stretch, or because you take a big bad beat, but this has to be momentary, we can't let it interfere with our future actions. I hope this helps, good luck.