The check & elevated temp reading is only there to get your attention.
Putting the bike in dealer mode would be a good place to start and check your battery cables are good and tight while you have the seat off, they have a tendency to work loose on bikes.
When the bike won't start what actually happens, will it crank & not fire or is there no crank ?
Will the fuel pump prime or not. ?
Does this happen with the bike in neutral or only when in gear. ?
What is displayed in the gear position indicator when this happens. ?
Have you made any changes to the bike. ?
Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.