I have seen similar behavior, on a field where I pass a neighbor who have wifi (locked with code) while I was using very stable 4G Hotspot on mobile phone.
Computer went from around 10% (half AOG half agio) up to 100 %, every time I had passed the neighbor.
I activated windows joblist and it turned out to be a windows malware update that ate the cpu power.
I then used CCleaner to shut down unnecessary startup programs (including this windows security updater) rebooted and problem solved.
Must say windows updates were already turned off!
And also both AOG and agio stayed at around 5%
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