You sound depressed. Loss of interest in work can be a symptom of depression. Feeling boring is about loss of self value. Possibly there are other things not go

You sound depressed. Loss of interest in work can be a symptom of depression. Feeling boring is about loss of self value. Possibly there are other things not going well in your life? You don't say how old you are but as you get older life moves from being super career focused to a point where other things start to matter. If you have not invested your life and time into other things then obviously you don't have a well balanced life to support you through the hard times. Probably you will regain your love for software development - I have fallen out of love with it a few times but it comes back as life changes. What you do need is balance - 1 hour per day exercise, you need plenty of human relationships in your day to day life (invest time in family, friends, others), work that interests you - (time to start looking for a new job?) and depending on your life stage maybe its time to start thinking about starting a family. Finally you definitely need to find a good counsellor/therapist to be talking this stuff over with - HN is not the place.