I have a DUO in an NTSC v5 PS2. The problem is that when playing Time Crisis 3, I frequently have the problem of the thumbcon not working during the sniper missions--the sniper view just keeps scrolling up as if I was holding the UP button on the thumbcon. Also, just today, the A button that I use to duck and reload gets stuck (automatically, that is right when the mission starts without me pressing it) as in my guy pops out and stays out no matter what I do.
The game is an NTSC original and I noticed that the problem is not there when I disable the modchip.
I also have Time Crisis 2 and I've never had such problems so I don't think it's the guncon.
Is this possible, can a modchip cause such a problem?