Why did applications start complaining about insufficient RAM?

Question

Windows

"Out of the blue", without installing any updates, some programs stopped running with an error due to insufficient RAM. Namely: some photo formats in Windows Photo Viewer stopped opening, and also one popular java game does not want to start (the other day everything worked fine). The task manager displays the correct amount of RAM: 2 4 GB sticks, 1200 MHz, DDR4. Shows consumption of 3/7.9 GB.
PS, Integrated graphics card Ryzen 3 2200g. There is also enough free space on the hard drive.

Windows Photo Viewer cannot display the image. There may be insufficient free memory. Close some unused programs, or if the hard drive is almost full, free up some disk space and then try again.

Answer 1

if the hard disk is almost full, free up some disk space and then try again