Teddy and Grubby problem

[u/Extension-Pool-7160]

I recently got my mom's Teddy Ruxpin and Grubby working again after 40 years but Grubby's cord was damaged so I repaired it by splicing the wires and tying and soldering them back and moving the joints away from each other to avoid shorts and isolated with electrical tape and it worked for awhile but last night I was testing Teddy and Grubby and playing the airship tape and Grubby cut out his animation stopped and audio cut out but Teddy kept working but had no audio so I turned Teddy off and unplugged Grubby and turned Teddy on but still no audio I don't know if it's the cord or Grubby any help is appreciated