Has the turntable been in constant use and just started misaligning, or has it been laid up and not been used for a period of time and started misaligning when you've come to use it again?
If it's not been used and the bridge wasn't moved during storage, it might require the drive belt replacing. (Big job, TT has to be stripped down!)
If it's been in constant use, check the compensation. It tells you how to do this in the instructions. (ALL 00 turntables should have +2 steps of compensation.) It's possible that you might have inadvertantly altered it. (Note if it isn't set at +2 and you change it to +2 then you will need to clear ALL tracks and reprogramme the turntable.)
Every now and then if I find that a couple of tracks start playing up and misaligning, rather than mess about trying to adjust one or two, it's actually quicker just to clear ALL saved track settings and reprogramme them all again. If you have a lot, just try programming the HEADS and TAILS on two or three of them. Try them a few times and also turn the power off and on which will allow the unit to calibrate. If all is well with them, programme in the rest of your tracks.