what does it mean if your cassette deck playback and recording sounds warbly?


what does it mean if your cassette deck playback and recording sounds warbly? I just got a brand new Tascam CD-A580, and my recordings and playback sounds shaky or warbly. 
leemurray2007
Seen the specs and the unit has a pitch control for the tape function. Check what happens when engaged or not. Otherwise what MC said. If nothing changes send it back.

G
"...@russ69 ok man. stop trolling my threads with negative comments. You are being a jerk..."

Sorry but a new deck should not do that, perhaps it should go back for repair/replacement.
EDIT: The problem today with a cassette deck is that most units will be low cost units with low cost drive mechanisms. I hope they can fix your issues because you are still trying to enjoy your cassette collection. 
@russ69 thanks man. I’m too late to ask if I can send it back, but I hope I can get them to make an acception.