I have a new desktop computer (Lenovo M81) that shutdowns unexpectedly. Other times, it is mouse and keyboard that become unresponding. If I put the computer to sleep and awake it, everything returns to normal.
I sent the computer to a certified technician, but he found nothing (computer wasn't shutting down for him) and simply replaced the PSU for prevention, but it didn't corrected the problem. It doesn't seem to be CPU, memory, overheating related. I even reinstalled the computer without success.
My last assumption would be that the shutdown is caused by current fluctuations. Is that possible? Can such problems also have repercussion on USB peripherals like keyboard and mouse? How can I be sure it is the source of the problem? Before spending 100$ for a UPS, I want to be sure it would correct my problem. What do you think?