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

"...@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. 

@petg60 thanks! I’ll do that

@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.

How's the Tascam 202MKVII?

Last time I checked suck is a verb.
Not sure what someone is who thinks it’s an epitaph.

My latest is a almost new Optima double reverse deck. It plays 4 sides consecutively AND smoothly.
$20 bill in a parking lot 5 miles away.

Love it.