GT4 'loading' clock turned red after adjusting laser

my GT4 wouldn't load at all, so I tried adjusting the laser height by the white knob under the laser cover
now, GT4 starts :) but when tracks, replays etc are loading sometimes the little loading clock turns red and if I tilt the ps2 it turns white and loads as usual

any ideas people ??
 
thought it was more a ps2 question tbh...
anyway, GT4 is the only game that works in my ps2 now, DVD's, backups etc won't work, so once GT4 has worn off (hopefully a long time) I think it's new ps2 time
 
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