Slow hot Cranking

I have a 2.0 1989 audi 80, it seams to fire fine when cold/warm, but if you have been driving in town and then stop for a minute it refuses to start the engine, it wont even crank probably only about 2-3 seconds
worth and then nothing, but leave it for 5mins and it will start agian
Any advice?
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Oliver Gunnell wrote:

cables/engine earth straps for cleanliness and security. Failing that it may be the starter motor.
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