Yeah I feel you there. Unfortunately my last group never let go of the few times I used traps (mind you, in obvious tapped areas like dungeons or bandit hideouts etc) and started asking to look for traps multiple times for an area.
I do tell them that no traps are in the area as far as they can tell and that their experience as an adventurer that this area feels safe, but they insist :P.
As is the fun of DM’ing!
That does sound frustrating, but unfortunately there’s not really a good solution. Like in theory you could tell the group that you just aren’t going to use traps anymore, which might get them to stop searching for traps so compulsively, but then you can’t ever use traps again. Or I guess you could at least tell them that searching once is enough to get a sense of where the traps are in a large area, so they don’t have to announce they are searching quite as often.