Large amounts of dat Cache files and a smaller number of dat Index file on my D Drive

I have a PC running Windows 10 with 32 gb of ram and three hard drives. The Photoshop 2020 program is on the C drive which is a 250 gb ssd. I shoot Nikon NEF files and process the raw files via Bridge and the Adobe Raw Converter. The other 2 drives are terrabyte hard drives.  The scratch disk order is D, E and C drives.  My images are stored on the E drive.  All drives are less than 50% full.  The problem is I keep getting large amounts of dat Cache files (eg. Cache_00_0000000020.dat) and a smaller number of dat Index files (eg. Index_06.dat) on my D drive when ever I use Photoshop.  After a recent Photoshop session I had 796 cache.dat files taking up 308 mb.  My wife has a similar system except she only has 16gb of ram.  She also shoots Nef and uses the same Adobe programs to process her images.  She does not get the dat. files building up on her machines.  Does anyone know what is causing this problem and how can I overcome it?

Thanks

Paul