For a long time I've used wired computers because they just don't have these issues. Battery (for me) last effectively forever. There's never any interference - no electric fences, electric wires, bike lights, etc. They just work and are accurate.

Recently someone I know had a bike that broke apart in the middle so it could be put in a case and taken as luggage on an airplane (that's what they do, they don't get to much hassle if they fly first class). So I bought an expensive wireless computer thinking maybe here was a situation that called for one - a Bontrager Trip 300. It was $120, 2.4ghz, supposed to be interference free.

First trip out, my wired computer says 10.1 miles, their computer says 95 miles. :-/ I looked on the internet, others had the same issue. Piece of junk.