I can't recall if the V1P uses a LiPo battery or supercaps to save the last file, but either can be replaced with some soldering. AliExpress is a good source for LiPo batteries (slow shipping though) and the usual electronics suppliers should have the super-caps. But still might not be the fix you need. If the cam is more than a couple years old I'd recommend something newer, several good 2K cams at that price level and a couple good 4K cams for just a little more.
Rexing is better than they were a couple years ago with QC, build quality, and customer service but I'd still rate those as somewhat marginal today. They're not bad cams but they're not really good ones either.
Phil