Keep an eye on system temperatures, the computer may be overheating. I recommend
HWMonitor, it will read CPU, motherboard, and GPU temperatures.
Solutions in order of ease, from easy to difficult:
1. Use
Display Driver Uninstall to get rid of existing drivers and reinstall latest drivers.
2. Try older drivers, the latest drivers aren't always best, and may not work as well with older hardware when focus is usually on the latest hardware and games. Go back several months if you have to, or up to 2 years. Use DDU to remove existing drivers.
3. Reinstall Chrome and any other programs that crash. It's unlikely that the programs are the problem, but it's easier than to...
4. Backup, format, and reinstall Windows. The simplest solution to irreversible or undetectable software/driver conflicts. Unless something is inherently wrong with the software or hardware in the first place.
4. Clean out the computer's inside. This is the option to jump to if the system is overheating. Check for any loose connections, if fans are spinning properly, and for clogged dust in vents and heatsinks.
5. Try the graphics card in another slot or even another computer if possible. Also try a spare or different graphics card in your PC, using DDU to reinstall drivers, of course.
6. Power supply might be failing. This is annoying to check, as it's a sealed box that not even techies should poke inside, given the dangers of electricity. Also annoying to move to another computer to check. You may want to try a different power supply to see if issues stop. This could be related to graphics if the power supply isn't feeding the graphics card properly, but not very likely at all.
7. Dying motherboard. Easier to check than a power supply, but even more annoying to remove and replace. Bulging capacitors are a sign of impending death. If it's not the video card, it may be the PCI-E slot. Unfortunately, P55/H55 motherboards are rare, even used. At least for me they are. I'm on a Gigabyte P55 with broken RAM slots.