Sounds like a bad voltage regulator to me. When they start to go bad, they can spike the system and cause the ECU to reset. The clue here was the RPM gauge going to zero, that's because the ECU supplies that data directly and when it cuts out, that will go to zero every time. The 848/1098/1198 are notorious for these issues and since you live in a warm climate, it would be the first thing on my list to look at. Ducati was suppose to fix the issues with the "EVO" models, but their fix isn't very good…. it's just a heat shied.
You can remove the voltage regulator from the bike entirely (unplug it) and ride it as a full-loss system. You will need to disconnect the fuse for the lights however as they will drain the battery quickly. Maybe do a quick ride around your neighborhood after getting the bike hot and see if the problem goes away. Don't go to far without a follow truck to bring you back when the battery gets below 10v… but it should run for at least 5 - 10 miles no problem and give you a good clue at whether or not that's the issue.
You can remove the voltage regulator from the bike entirely (unplug it) and ride it as a full-loss system. You will need to disconnect the fuse for the lights however as they will drain the battery quickly. Maybe do a quick ride around your neighborhood after getting the bike hot and see if the problem goes away. Don't go to far without a follow truck to bring you back when the battery gets below 10v… but it should run for at least 5 - 10 miles no problem and give you a good clue at whether or not that's the issue.