Fisher dd350 tape deck not working?

I have a Fisher DD350 tape deck, which until recently was working perfectly.

It has developed a problem that when you press play, the tape starts to play, but then after about 5-10 seconds, it stops playing, as if someone has pressed the stop button.

Can you suggest a way to stop this annoying thing happening, so i would once again be able to enjoy using this piece of equipment.

Any info or suggestions you may be able to offer would be much appreciated.

Thanks in advance