Hi. No I haven't yet, or at least may have an idea. I have some cctv installed on my car. First I had them fitted directly to my battery and after 6 months I had the problem with the 12v battery. After the cables have been moved to the fuse panel and in 1 month I had the same issue. Before it happened I've never charged my car. Than I started to charge it every weekend but still didn't helped. So I've disconnected them completely and in nearly 2 months nothing happened again, but I've been charging my car every 2 days.
But I had to connect them back because due to my job I have to. For nearly a month now, nothing happened and I hope it doesn't. But it is strange because the company who fits the cctv, are fitting to even full electric cars, hybrids like mine and nothing ever happened.
And if you use a dashcam there are big chances to drain your battery, from what I've been told by skoda