Did you buy your Gorgar from a collector - hobbyist or is it fresh out of a house that had owned it for many years? Those early solid state pinballs can require a lot of "bulletproofing" to make them reliable. If a pinhead owned it for a while, lots of that is probably done. If from a house of many years, maybe not done.

If you are handy with repairing boards, you can do the bulletproofing by following the "vid1900 guide" on pinside. Otherwise there are a number of great board repairmen out there that do this stuff all the time.

Your situation reminds me so much of my own entrance into the pin hobby. Here is my first thread on pinside. It was about my unruly Gorgar and how to fix it. The vid guide link can be found in the thread. https://pinside.com/pinball/forum/topic/gorgar-gorgar-gorgar-ect-ect

Yeah, you need a good flipper rebuild there, BUT to me it looks like a very nice condition game! Much nicer then the Gorgar I bought 6+ years ago. Those look like pretty old batteries. They need changing. If you want to not change any of the settings it has now, change the batteries with the game on.

My 2 cents worth on issues that you are having. Some will be intermittent, others might be more stubborn. I would recommend having a pro bullet proof those boards. Have them install NVRAM at that time. No more batteries needed. Your battery holder isn't perfect I see, with the NVRAM it will all be eliminated. That game is totally worth it.