In May 2024 while flying my 10 year old SS7 with a Rotax 912ULS, the Dynon FlightDek D180 screen quickly looked scrambled and then went black taking the voltmeter display with it. After landing I ordered and installed a new Ducati voltage reg and a new battery. Everything was fine until four days ago. Fifteen minutes into the flight, the D180 went black. I turned back toward the airport and in a few minutes the Garmin Nav/com gave a low voltage warning. I turned off the radio and transponder. The electric trim motor turned ever so slowly before landing. I charged the battery over night. The next day I disconnected the battery charger in the hangar and flipped the master switch on (first i would see if the D180 displayed and then I could view the voltmeter to trouble shoot the first problem). Much to my surprise when I flipped the master switch, the starter motor engaged and the prop turned a revolution or two before I turned off the switch. Problem #2. Two days later I installed a new starter solenoid so I could flip the master on and solve problem #1. Master switch on, propeller didn?t move and voltmeter showed 13.8v. I started, ran for a few minutes then flew for 45 minutes and the voltage stayed between 13.8 and 14 the whole time flawlessly. So..did the 5 month old voltage regulator quit one day and work fine the next? When did the starter solenoid ?stick? closed?during the previous flight, at shut down, other? Did the solenoid have anything to do with the 5 month old battery losing its charge? Was it two completely separate issues that just happened to occur at the same time? I have replaced a starter solenoid two other times in 10 years because it WOULDNT engage to energize the starter. For those wondering what the voltmeter showed before the screen went black, I don?t know because the voltmeter on the D180 is on a different screen/page from the PFD and isn?t in view during normal flight. I can?t make any sense of it. Hopefully those of you who know more about electronics than I do will share their thoughts. Thanks.