The battery change provides some hint. I recycled the ignition battery several times before today's flight. Looks like it helps as I can start the engine three times when it was warm.

As the heat trapped inside the cowl can affect other components (ign module, and/or carb in particular), I would think the ig. module definitely plays a role.

Have called DA last week explaining the problem. Their recommendation is to send it in for potential upgrade. Do not know additional potential upgrade is necessary other than the fuel line one (into the carb black block, instead of the engine body). Any idea?

Hesitate to send it in because afraid of loosing flight time. The weather here is perfect for fly (80 degree, calm wing).

--qc