Bobcat 2035 trouble starting after running

[Bobctat2035]

Ran it about 6 hours over the weekend. Started right up today. Ran about 20 minutes, off for 5 and it took a second or two to turn over. Didn't think that much of it but it was even worse 15 minutes later. All fairly light duty work.

138 Hours. All fluids changed at 110 hours.
Not cold. Always kept inside our warehouse.

What should I check for?

 

[Peter 315]

Slow cranking the engine over?