Sudden problem with turntable

I tried the magic eraser and that wasn’t it. I think I will need to check everything from scratch, including cartridge setup, platter level, ball bearing lubricant....Never done that before so it should be a good learning experience. The odd thing is it seemed to happen quickly went from sounding good to slightly slow or hollow. Just missing something and I can’t put my finger on it. Very annoying. 

Go to Vinyl Asylum and download the best protractor for your arm, put it on your table and follow the lines it's easy. If you think it's low on oil maybe from shipping don't use it till you top it off, look in there with a flashlight. First thing I would do find recommend tracking force for your cartridge and see what your tracking force is set at, to much force will dull sound. If you don't have a tracking force gauge make the arm float with the counter weight,set dial to zero without moving counterweight, then turn counterweight to cartridge recommended tracking force. Just be careful of not damaging needle while making it float. 

I'd vote against that last suggestion. You can get a surprisingly good digital stylus force gauge in 2 days or less on amazon for about $11. Cheers,
Spencer

Sorry, meant Vinyl Engine for protector

Could it be that the suspension on your cartridge has given up the ghost and collapsed, and (at the worst) you're just dragging along on the cartridge body?