I previously asked A superior is complaining about me for things that are not my responsibility - should I tell their superior? and really appreciated the answer by maple_shaft to act as professional and cooperative as possible toward to company and boss.
My only problem is, no matter how much I want to go above and beyond all the time, there are days - and increasingly often so - where I can do 100%, but cannot go to 1% more let alone up to 150%, simply because there are no resources, I am extremely tired and feel physically exhausted, or I have a personal commitment.
In other words, many of the "mistakes" that happen are due to the assumption by one person that I always go above and beyond when it comes to certain tasks; however, we all act according to processes and there is no documented or commanded process for the things I am asked to do when I am in "above and beyond" mode.
I am seriously frustrated at the fact that I am being given blame or responsibility for something that is going wrong because I sometimes try to help outside normal hours. To be totally frank I see that as a favor from my part and not my responsibility. How can I put this in a professional way, and explain to someone that they should not expect me to go above and beyond every single working day? That I need to draw the line?
And, for the sake of being constructive, how do I still contribute positively to the company and appear in good faith despite the lack of resources, time and processes mentioned above?