My trackball went through a stage of 'double clicking' whenever I pressed it. (i.e. if I opened a menu it would also select the highlighted option in one click).
Now it has gone to the other extreme and I have to push VERY hard to get it to click. There are no issues with scrolling.
I am picking this is not a diry trackball issue as I imagine the click is something on the circuit board? Can I fix this myself without needing too much technical know how?
You can try cleaning it yourself. Take out the battery, turn it over (face down, carefully), press in the trackball and roll it around vigorously. That usually helps me with such issues.