Procrastination is a great one.

To me it is a combination of misunderstandings:

It’s too hard, I can’t do it

Usually the first of these is the misunderstanding about their own abilities. The person feels that the job/task/communication is out of their skillset, the feel that even if they do perform the actions needed they will still not get it right, therefore try to avoid this ‘failure’ by not doing it. Or they want to be proved right , that they are unable to do it, by leaving it so long that they have to rush it and never get to complete it fully, thus proving they were unable to do it. (This gives them a strange self satisfied content feeling that proves they can trust their own judgement)

Need vs Want

The second is that they do not understand the true value of getting that thing done, and how it ties into them achieving their goals.  They do understand that physically that event needs to happen, write a report, do the accounts, clean the house etc, but they do not integrate that with any of their long or short term goals (and the rewards that that will bring) and therefore see everything as a chore that NEEDS to be done rather than a positive action that they WANT to do as it will get them to the point they are looking to be at.
Most people have hobbies/activities that they will always find time for, this is because they WANT to do it because they unconsciously get something from it (pleasure, satisfaction, confidence, interactions etc) this unconscious recognition fuels their want for the next time that activity occurs. (This relates/equates to the self satisfied content feeling mentioned above) Learning to identify the positive rewards from things you WANT to do and seeing if you can find these in the things you NEED to do will help you WANT to do those too.

Lack of, or incorrectly defined goals

This ties in with Needs vs Want, lots of people have incorrectly defined goals, that is to say they have not dug deep enough.
They want a too earn more money, they want a bigger house, they want a partner etc. These are all WANTS but they are not actually identify the true outcome. Earning more money does not in itself change anything, it is what you will do with it (and the rewards that give you) that mean something. Therefore look at the next step to see what that fulfils for you, safety , security, freedom, joy etc as recognising that doing something will bring you joy or freedom is a far better motivator that it bring you an extra £100.

Breatking the cycle

By addressing any or all of these misunderstanding you can break the cycle that you have been caught up in and better relate to completing the thing you have been avoiding.