After not using my ps2 for a few months, I fired it up today, but noticed a weird problem that I haven't heard of before.

For some reason, even when I am not even touching the ps2 controller, the ps2 responds (in the game) as if I was pushing buttons.

I've opened up the ps2, and swapped the controller port around with another one, and I still have the same problem, I then replaced the laser in the other one and used the original controller port for it, and it has exactly the same problem, the only thing in common with these two machines is the laser, could that really be causing the problem?