What's a word that means "we fix things without you noticing"?
Solution 1:
seamless Cambridge Dictionary
without noticeable change from one part to the next
As in:
We seamlessly fix things without you noticing.
Solution 2:
Depending on the audience, "transparently" might be appropriate, as in this Q&A:
Some devops heavyweights release software updates thousands of times per day — often so transparently that their users are not even aware.
Word for "a change not noticable, transparent to users"