Yep! That's what starts to happen lol, I need to hold mine diagonally and upside down above my head to get it to read discs anymore. It progressivly gets worse and worse, BUT if you have the technical know how, yours sounds like it's just starting to do this. Open that bitch up and take the cover off the CD drive and play with that white cog a little then see if your ps2 will read a disc any better than it was before. That white cog, each time you turn it it moves the laser either higher or lower (depending on which way you turn it). BTW a good idea is to mark off where it was to begin with in case you want to put it back to normal.
Ver. 3 NTSC independence exploited ps2, 120 gig WD HDD, HDLoader .8c, Ulaunchelf 4.04, Blackrhino linux on WD 40 gig HDD