S3700 slow lag with the platter on

Hi I have just got a used one of these and i’m running it in midi and connected to my Pioneer controller using Virtual DJ.

When i have the platter running (which is the whole reason i bought it) it kicks off really slow at maybe 120/125 BPM for 3-5 seconds then rapidly accelerates to the correct 131 BPM (that ive set it at). same if i scratch, soon as i let go there is a 3-5 second slow lag again then accelerates. ive got the torque on high any ideas what the problems is?? and more importantly how to resolve it.

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