yep ur lens sounds to be worn out, u either need to replace the lens or caliberate the lens which will give u another couple of months before it dies completely.
installer in the UK
currently a proud owner of:
ps2 V10 customized case + DMS4pro + 250GB HDD
xbox V1.4 customized case + IRmod + X3 + XLCD + USB adapter + 2 x 400GB & 300GB HDD total = 1.1TR of Space
Jap Sony PSP and Nintendo DS
for mod installs in UK email me firstname.lastname@example.org