Activated Carbon filter in a resin Filter tank, can they block ?

Hi folks, I have a well at home with an activated carbon filter. The mains feed that go to the house has activated carbon filter in it. Intermittently, the feeds have manifested air in the lines. It does run out eventually. This can happen at any time. It’s not the well as the water doesn’t change colour, no sediment and air runs out. I changed the pressure vessel on pump and turning water off, the pressure stays in the well feed not drop. So yesterday I bypassed my activated carbon filter, issue hasn’t happened so far. I’m wondering can an activated carbon filter block up? It’s in a resin tank with pump on top. Also I have neglected it, I haven’t changed carbon in 3 years. So I’m hoping this is the issue as I haven’t changed the carbon in it and wondering is it clogged up? Any thoughts folks? Have since read not changing can cause coliforms so I will be emptying and cleaning anyway. What do people think ?