record cleaning?

hey guys,
I'm starting to have an annoying problem of sound being super distorted when the needle reaches between a third and half of the record. the playback gets really dirty and slow and it's fucking up my mix big time.
I believe this is due to dust or something like that but it is not that obvious (i.e. there is not like a layer of dirt on the record, they even look kind of clean actually)
if i move the needle back to the beginning of the record, the sound is clear again.
I might have an audio sample for you to listen to it but do you guys have an idea before I upload something?
I'm starting to have an annoying problem of sound being super distorted when the needle reaches between a third and half of the record. the playback gets really dirty and slow and it's fucking up my mix big time.
I believe this is due to dust or something like that but it is not that obvious (i.e. there is not like a layer of dirt on the record, they even look kind of clean actually)
if i move the needle back to the beginning of the record, the sound is clear again.
I might have an audio sample for you to listen to it but do you guys have an idea before I upload something?