Yes, this happens to me from time to time. Usually it means I need a new project, with different people. I then usually look for a new project in my company, o

Yes, this happens to me from time to time. Usually it means I need a new project, with different people. I then usually look for a new project in my company, or look at parts from my current project I've never looked at, and which will help me meet new people (say networks, databases, business, etc), and learn things, which will in turn allow me to branch into something new. You shouldn't worry, it will come back.