On 10/11/2018 21:24, Nemo wrote:

she has noticed that it often happens when she has a computer problem,
the problem disappears when help shows. I have speculated
the computer feels her dislike and takes it amiss!

My ex-sister-in-law, who had arts rather than scientific training,
posited a scientific law to explain such phenomena:
The Law Of Inanimate Hostility