Head scratching inquiry

[alphaomega16]

Hello all, my dads PC for some reason when he chooses to restart it after it powers down it doesn't come back on straight away it stays off for like 2-3 minutes then comes to life and boots up again, has anybody ever seen this kind of behaviour before?

It was a PC I done a few years ago for him but installed an nvme drive last year but have no idea how long its been doing this.

this is the system he has copy pasted from old thread here
My basket at Overclockers UK:

• 1 x Fractal Design Core 1000 & XFX 430W 80+ Bronze PSU Bundle= £44.99
• 1 x Samsung 250GB 850 EVO SSD 2.5" SATA 6Gbps 32 Layer 3D V-NAND Solid State Drive (MZ-75E250B/EU)= £64.99
• 1 x Gigabyte GA-H170M-D3H Intel H170 (Socket 1151) DDR4 Micro ATX Motherboard= £82.99
• 1 x Team Group Elite 8GB (2x4GB) DDR4 PC4-19200C16 2400MHz Dual Channel Kit - Black (TPKD48GM2400HC16DC0= £29.99
• 1 x Intel Core i3-6100 3.70GHz (Skylake) Socket LGA1151 Processor - Retail= £99.95

 

[alphaomega16]

It does have a few USB's plugged in I believe, I can check on fast boot and ive not long replaced the battery as on his old windows 7 install before going to 10 the time on his computer kept going backwards, after an hour of updating time it would go back several hours, it was really odd, put on windows 10 with no key so he has the watermark but he doesn't care about that and the time thing didn't happen again so unsure as to what cause that issue.

Although he had been using the same setup for years, thanks for the suggestions, will tell him to unplug all but keyboard and mouse before the next restart to see if that changes anything.