There seems to be a lot of confusion in this post.
1.) What "new minimum" are your referring to? The required specs for the game were updated in Feb. 2022 because
Nvidia stopped their driver support for the 600 and 700 series cards. A studio cannot continue to support hardware that doesn't have drivers written for current operating systems. The new specs reflect what should provide stable performance based on the current build of the game, though the game should continue to function on the GTX 780 or higher. (You're GPU doesn't meet the original required specs, so yes, you should expect that performance will suffer.)
2.) The problem is not solely because of your specs. There are people running an RTX 3090 ti that watch their framerates tank with the latest patch. It's an issue with certain PC configs, as stated, and until the problem is identified, it will continue to be an issue. But, just like all of the other performance issues the game suffered from have been improved over time, so, too, will this one.
3.) I've seen only a few reports of the game crashing due to menus. These types of errors are normally the result of a modded game conflicting with an update, aggressive anti-virus and the like, or a Windows issue (like the game being installed on a protected directory). I can use menus and exit the game without any crashes at all.
4.) What is a "VGA spike"? Are you referring FPS slowdown, or something else? If running the game on hardware below minimum specs, this is an issue, as GPUs will automatically throttle and then shut down to avoid overheating. In your situation, you're running the game on hardware that was below original required specs. I would strongly recommend not continuing to do so if you believe the GPU is crashing to protect itself.
_______________
Due to the nature of 1.6 (especially for installations and playthroughs that have been through several updates), it may be necessary to follow these steps:
a.) Return all graphical settings to default via the main menu. Exit the game, and restart, applying graphical settings to preference again. The graphical levels that define
Low, Medium, High, Very High, etc. were rebalanced with this patch. There could be weirdness as a result.
b.) The game may require a CLEAN re-installation if problems persist.
Be sure to follow these steps to the letter.
For issues that persist, players should contact CDPR Support directly.