2019 Toro MX 5025 hot weather no start

Ok, here is the deal-
First thing in the morning when cold, mower starts right up. If I try in the afternoon when the weather is hot, I turn the key and nothing. I by passed the seat safety switch for testing. Same results, starts when weather is cool, not after running it or when it sets in warm/hot weather.
Some youtube video's suggest it is the safety system brain box which reads the signals from brakes switch, seat switch and so on.
I don't see it being the solenoid or starter as the mower just setting for a while when weather hot is the issue.
Changed the key switch as well.
Suggestions on what to check next ?
Thanks !!

It has a Kawasaki motor Not at the mower right now for hp and model.
The motor does not turn over at all. Overnight then next morning cranks and runs like a champ. If I shut if off to move something, it doesn't crank and run until it sets and cools down.

No picture posted.
 
Try jumping the starter solenoid if there's a separate mounted one, see if it spins over.. 
 
You can also run a direct, 12 volt line (from the battery)  to the starter to see if it cranks...
I'm suspecting a bad starter itself...  If it does NOT spin over with 12 volts direct to the starter-the starters toast.
 
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